February 28, 2023

May 31, 2022

Convertible debenture in the principal amount of $4,000,000 (the “U.S. Convertible Debenture 1”) dated October 31, 2018, which bears interest, payable quarterly, at a rate of 8% per annum, with interest during the first eighteen months following issuance being payable by increasing the then-outstanding principal amount of the U.S. Convertible Debenture 1. The U.S. Convertible Debenture 1 was to mature on a date that was three years following issuance. The U.S. Convertible Debenture 1 was convertible into units (the “Convertible Debenture Units”) at a conversion price of $3.20 per Convertible Debenture Unit. Each Convertible Debenture Unit consisted of (i) one share of the Company’s common stock, and (ii) one-half of one warrant, with each warrant exercisable for three years to purchase a share of common stock at a price of $4.40. On July 26, 2019, U.S. Convertible Debenture 1 was amended such that, should the Company issue or sell common stock or equity securities convertible into common stock at a price less than the conversion price of the U.S. Convertible Debenture 1, the conversion price of U.S. Convertible Debenture 1 would be reduced to such issuance price, and the exercise price of the warrant issuable in connection with U.S. Convertible Debenture 1 would be exercisable at a price equal to 137.5% of the adjusted conversion price at the time of conversion. The U.S. Convertible Debenture 1 has other features, such as mandatory conversion in the event the common stock trades at a particular price over a specified period of time and required redemption in the event of a “Change in Control” of the Company. The U.S. Convertible Debenture 1 is an unsecured obligation of the Company and ranks pari passu in right of payment of principal and interest with all other unsecured obligations of the Company. The Company recorded a discount in the amount of $3,254,896 on the U.S. Convertible Debenture 1. During the three and nine months ended February 28, 2023, the Company accrued interest in the amounts of $36,036 and $171,169 on the U.S. Convertible Debenture 1, respectively. During the three and nine months ended February 28, 2023, the Company made interest payments in the amounts of $0 and $90,089, respectively. On April 15, 2021, the U.S. Convertible Debenture 1 was amended as follows: (i) the conversion price of the debenture was reduced to $1.20 per unit; and (ii) the maturity date was extended from October 31, 2021 to October 31, 2022. This amendment was accounted for as an extinguishment of debt, and the Company recorded a loss in the amount of $2,038,803 during the year ended May 31, 2021 in connection with the amendment. On September 15, 2022, the U.S. Convertible Debenture 1 was further amended as follows: (i) the conversion price of debentures with a principal amount of $2,702,674 was reduced to $0.285 per unit, and these debentures along with accrued interest in the amount of $45,044 were converted to 9,641,118 shares of common stock and warrants to purchase 4,820,560 shares of common stock; (ii) the conversion price of the remaining debentures with a principal amount of $1,801,783 was reduced to $0.40 per share; (iii) the maturity date of 50% of the remaining debentures with a principal amount of $900,891.50 was extended to December 31, 2023, and the maturity date of 50% of the remaining debentures with a principal amount of $900,891.50 was extended to December 31, 2024; and (iv) the conversion price of the warrants issuable upon conversion of the debentures was reduced to $0.40. The value of the warrants will be determined when the issuance becomes probable. This amendment was accounted for as an extinguishment of debt, and a loss in the amount of $1,689,368 was recorded on this transaction.

February 28, 2023

May 31, 2022

Convertible debenture in the principal amount of $1,000,000 (the “U.S. Convertible Debenture 2”) dated October 31, 2018, which bears interest, payable quarterly, at a rate of 8% per annum, with interest during the first eighteen months following issuance being payable by increasing the then-outstanding principal amount of the U.S. Convertible Debenture 2. The U.S. Convertible Debenture 2 was to mature on a date that was three years following issuance. The U.S. Convertible Debenture 2 was convertible into Convertible Debenture Units at a conversion price of $3.20 per Convertible Debenture Unit. Each Convertible Debenture Unit consisted of (i) one share of the Company’s common stock, and (ii) one-half of one warrant, with each warrant exercisable for three years to purchase a share of common stock at a price of $4.40. On July 26, 2019, U.S. Convertible Debenture 2 was amended such that, should the Company issue or sell common stock or equity securities convertible into common stock at a price less than the conversion price of the U.S. Convertible Debenture 2, the conversion price of U.S. Convertible Debenture 2 would be reduced to such issuance price, and the exercise price of the warrant issuable in connection with U.S. Convertible Debenture 2 would be exercisable at a price equal to 137.5% of the adjusted conversion price at the time of conversion. The U.S. Convertible Debenture 2 has other features, such as mandatory conversion in the event the common stock trades at a particular price over a specified period of time and required redemption in the event of a “Change in Control” of the Company. The U.S. Convertible Debenture 2 is an unsecured obligation of the Company and ranks pari passu in right of payment of principal and interest with all other unsecured obligations of the Company. The Company recorded a discount in the amount of $813,724 on the U.S. Convertible Debenture 2. During the three and nine months ended February 28, 2023, the Company accrued interest in the amounts of $9,009 and $42,792 on the U.S. Convertible Debenture 2, respectively. During the three and nine months ended February 28, 2023, the Company made interest payments in the amounts of $0 and $22,522, respectively. On April 15, 2021, the U.S. Convertible Debenture 2 was amended as follows: (i) the conversion price of the debentures was reduced to $1.20 per unit; and (ii) the maturity date was extended from October 31, 2021 to October 31, 2022. This amendment was accounted for as an extinguishment of debt, and the Company recorded a loss in the amount of $509,700 during the year ended May 31, 2021. On September 15, 2022, the U.S. Convertible Debenture 2 was further amended as follows: (i) the conversion price of debentures with a principal amount of $675,668 was reduced to $0.285 per unit, and these debentures along with accrued interest in the amount of $11,261 were converted to 2,410,279 shares of common stock and warrants to purchase 1,205,140 shares of common stock; (ii) the conversion price of the remaining debentures with a principal amount of $450,446 was reduced to $0.40 per share; (iii) the maturity date of 50% of the remaining debentures with a principal amount of $225,223 was extended to December 31, 2023, and the maturity date of 50% of the remaining debentures with a principal amount of $225,223 was extended to December 31, 2024; and (iv) the conversion price of the warrants issuable upon conversion of the debentures was reduced to $0.40. The value of the warrants will be determined when the issuance becomes probable. This amendment was accounted for as an extinguishment of debt, and a loss in the amount of $422,331 was recorded on this transaction.

February 28, 2023

May 31, 2022

Convertible debenture in the principal amount of $532,000 (the “U.S. Convertible Debenture 4”) dated October 25, 2018, which bears interest, payable quarterly, at a rate of 8% per annum, with interest during the first eighteen months following issuance being payable by increasing the then-outstanding principal amount of the U.S. Convertible Debenture 4. The U.S. Convertible Debenture 4 was to mature on a date that was three years following issuance. The U.S. Convertible Debenture 4 was convertible into Convertible Debenture Units at a conversion price of $3.20 per Convertible Debenture Unit. Each Convertible Debenture Unit consisted of (i) one share of the Company’s common stock, and (ii) one-half of one warrant, with each warrant exercisable for three years to purchase a share of common stock at a price of $4.40. The value of the warrants will be recorded when the issuance becomes probable. On July 26, 2019, U.S. Convertible Debenture 4 was amended such that, should the Company issue or sell common stock or equity securities convertible into common stock at a price less than the conversion price of the U.S. Convertible Debenture 4, the conversion price of U.S. Convertible Debenture 4 would be reduced to such issuance price, and the exercise price of the warrant issuable in connection with U.S. Convertible Debenture 4 would be exercisable at a price equal to 137.5% of the adjusted conversion price at the time of conversion. The U.S. Convertible Debenture 4 has other features, such as mandatory conversion in the event the common stock trades at a particular price over a specified period of time and required redemption in the event of a “Change in Control” of the Company. The U.S. Convertible Debenture 4 is an unsecured obligation of the Company and ranks pari passu in right of payment of principal and interest with all other unsecured obligations of the Company. The Company recorded a discount in the amount of $416,653 on the U.S. Convertible Debenture 4. During the three and nine months ended February 28, 2023, the Company accrued interest in the amounts of $10,500 and $35,009 on the U.S. Convertible Debenture 4, respectively. During the three and nine months ended February 28, 2023, the Company made interest payments in the amounts of $0 and $23,964, respectively. On April 19, 2021, the U.S. Convertible Debenture 4 was amended as follows: (i) the conversion price of the debenture was reduced to $1.20 per unit; and (ii) the maturity date was extended from October 25, 2021 to October 25, 2022. This amendment was accounted for as an extinguishment of debt, and the Company recorded a loss in the amount of $271,164 during the year ended May 31, 2021. On October 25, 2022, the Company received a notice of demand from the lender, placing the U.S. Convertible Debt 4 into default status. On November 1, 2022, the Company entered into a forbearance agreement with the lender (the “Forbearance Agreement”) with the following terms: (i) the Company will pay the lender the amount of $150,000 on November 2, 2022, and an additional $50,000 each month for the following nine months, or a total of $600,000; (ii) the default interest rate of 12% will be applied on the existing principal balances until paid in full; (iii) lender shall forbear from taking any further action based upon the existing default. As a result of this agreement, the Company capitalized $3,283 of accrued interest. During the three and nine months ended February 28, 2023, the Company made payments in the aggregate amount of $150,000 and $350,000, respectively, pursuant to Forbearance Agreement. The Company recognized a gain in the amount of $2,384 on this transaction during the nine months ended February 28, 2023.

February 28, 2023

May 31, 2022

Convertible debentures payable in the aggregate principal amount of $12,012,000 (the “Canaccord Debentures”) dated December 12, 2018, which bear interest, payable quarterly, at a rate of 8% per annum, with interest during the first eighteen months following issuance being payable by increasing the then-outstanding principal amount of the Canaccord Debentures. The Canaccord Debentures were to mature on a date that was three years following issuance. The Canaccord Debentures were convertible into Convertible Debenture Units at a conversion price of $3.20 per Convertible Debenture Unit. Each Convertible Debenture Unit consisted of (i) one share of the Company’s common stock, and (ii) one-half of one warrant, with each warrant exercisable for three years to purchase a share of common stock at a price of $4.40. The Canaccord Debentures have other features, such as mandatory conversion in the event the common stock trades at a particular price over a specified period of time and required redemption in the event of a “Change in Control” of the Company. The Canaccord Debentures are unsecured obligations of the Company and rank pari passu in right of payment of principal and interest with all other unsecured obligations of the Company. During the three months ended November 30, 2019, in two separate transactions, principal in the aggregate amount of $25,857 was converted into an aggregate of 8,081 shares of the Company’s common stock, and warrants to purchase 4,040 shares of common stock. There were no gains or losses recorded on these conversions because they were done in accordance with the terms of the original agreement. No discount was recorded for the fair value of the warrants issued. Because the market price of the Company’s common stock was less than the conversion price on the date of issuance of the Canaccord Debentures, a discount was not recorded on the Canaccord Debentures. During the three and nine months ended February 28, 2023, the Company accrued interest in the amounts of $105,077 and $501,089 on the Canaccord Debentures, respectively. During the three and nine months ended February 28, 2023, the Company made interest payments in the amounts of $0 and $264,383, respectively. On March 31, 2021, the Canaccord Debentures were amended as follows: (i) the conversion price of the debentures was reduced to $1.20 per unit; (ii) the maturity date was extended from December 12, 2021 to December 12, 2022; (iii) the mandatory conversion threshold was reduced from a daily volume weighted average trading price of greater than $4.80 per share to $2.40 per share for the preceding ten consecutive trading days; and (iv) the exercise price of the warrants issuable upon conversion was reduced from $4.40 to $1.60 and the expiration of the warrants extended until March 31, 2024. This amendment was accounted for as an extinguishment of debt, and the Company recorded a loss in the amount of $3,286,012 during the year ended May 31, 2021. During the year ended May 31, 2022, principal in the aggregate amount of $281,000 was converted into an aggregate of 234,167 shares of the Company’s common stock, and warrants to purchase 117,084 shares of common stock. There were no gains or losses recorded on these conversions because they were done in accordance with the terms of the original agreement. On September 15, 2022, the Canaccord Debentures were further amended as follows: (i) the conversion price of debentures with a principal amount of $7,965,278 was reduced to $0.285 per unit, and these debentures along with accrued interest in the amount of $132,755 were converted to 28,414,149 shares of common stock and warrants to purchase 14,207,075 shares of common stock; (ii) the conversion price of the remaining debentures with a principal amount of $52,53,873 was reduced to $0.40 per share; (iii) the maturity date of 50% of the remaining debentures with a principal amount of $2,626,936.50 was extended to December 31, 2023, and the maturity date of 50% of the remaining debentures with a principal amount of $2,626,936.50 was extended to December 31, 2024; and (iv) the conversion price of the warrants issuable upon conversion of the debentures was reduced to $0.40. The value of the warrants will be determined when the issuance becomes probable. This amendment was accounted for as an extinguishment of debt, and a loss in the amount of $4,547,660 was recorded on this transaction.

Total - Convertible Notes Payable

Less: Discount

)

)

Convertible Notes Payable, Net of Discounts

February 28, 2023

May 31, 2022

Total - Convertible Notes Payable, Net of Discounts, Current Portion, net of discount

Total - Convertible Notes Payable, Net of Discounts, Long-term Portion, net of discount

Discounts on notes payable amortized to interest expense – 3 months ended February 28, 2023 and 2022, respectively

Discounts on notes payable amortized to interest expense – 9 months ended February 28, 2023 and 2022, respectively