Subject to the terms and conditions set forth in this Agreement, ​ wishes to sell to ​, and ​ wishes to buy from ​, shares of ​'s common stock, $0.000666 par value (the “Common Stock”), subject to the terms and conditions of this Agreement. The shares of Common Stock purchased hereunder are referred to herein as the “Purchase Shares.”

Subject to the terms and conditions set forth in this Agreement, ​the Company wishes to sell to ​,the Buyer, and ​the Buyer wishes to buy from ​, sharesthe Company, up to Twelve Million Dollars ($12,000,000) of ​'the Company’s common stock, $0.000666 par value $0.001 (the “Common Stock”“Common Stock”), subject to the terms and conditions of this Agreement.. The shares of Common Stock to be purchased hereunder are referred to herein as the “Purchase“Purchase Shares.””

Subject to the terms and conditions set forth in this Agreement, ​the Company wishes to sell to ​,the Buyer, and ​the Buyer wishes to buy from ​, sharesthe Company, up to Twenty-two Million Dollars ($22,000,000) of ​'the Company’s common stock, $0.000666 par value $0.001 per share (the “Common Stock”“Common Stock”), subject to the terms and conditions of this Agreement.. The shares of Common Stock to be purchased hereunder are referred to herein as the “Purchase“Purchase Shares.””

SubjectReference is made to the termsthat certain Purchase Agreement, dated as of September 21, 2018 (the “Purchase Agreement”), entered into by and conditions set forth in this Agreement, ​ wishes to sell to ​, and ​ wishes to buy frombetween ​, ​ (the “Company”), and ​ (the “Buyer”) pursuant to which the Company has agreed to issue to the Buyer shares of ​'the Company's common stock, $0.000666Common Stock, par value $0.001 per share (the “Common Stock”), subjectin an amount up to Five Million Dollars ($5,000,000) (the “Purchase Shares”), in accordance with the terms and conditions of thisthe Purchase Agreement. TheIn connection with the transactions contemplated by the Purchase Agreement, the Company has registered with the U.S. Securities & Exchange Commission up to 3,727,387 shares of Common Stock purchased hereunder are referred to herein asbe issued to the Buyer upon purchase by the Buyer from the Company from time to time (the “Purchase Shares.”Shares”).

SubjectWe are counsel to the terms and conditions set forth in this Agreement, ​ wishes to sell to, ​ (the “Company”), and have represented the Company in connection with that certain Purchase Agreement, dated as of January 25, 2022 (the “Purchase Agreement”), entered into by and between the Company and ​, and ​ wishes(the “Investor”) pursuant to buy from ​,which the Company has agreed to issue to the Investor shares of ​'the Company’s common stock,Common Stock, $0.0006660001 par value (the “Common Stock”“Common Stock”), subjectin an amount up to Five Million Dollars ($5,000,000.00) (the “Put Shares”), in accordance with the terms and conditions of thisthe Purchase Agreement. TheIn connection with the transactions contemplated by the Purchase Agreement, the Company has registered with the U.S. Securities & Exchange Commission the following shares of Common Stock purchased hereunder are referred to herein as the “Purchase Shares.”Stock:

SubjectWe are counsel to the terms and conditions set forth in this Agreement, ​ wishes to sell to ​, and ​ wishes to buy from ​, ​ (the “Company”), and have represented the Company in connection with that certain Purchase Agreement, dated as of December 4, 2023 (the “Purchase Agreement”), entered into by and between the Company and ​ (the “Buyer”) pursuant to which, among other things, the Company has agreed to issue to the Buyer shares of ​'the Company’s common stock, $0.000666Common Stock, par value $0.0001 per share (the “Common Stock”), subjectin an amount up to Five Million Dollars ($5,000,000) (the “Purchase Shares”), in accordance with the terms of the Purchase Agreement. In connection with the transactions contemplated by the Purchase Agreement, the Company has registered with the U.S. Securities and conditions of this Agreement. TheExchange Commission (the “SEC”) ​ shares of Common Stock purchased hereunder are referredthat may be issued and sold by the Company to herein as the Buyer from time to time (the “Purchase Shares.”Shares”).

SubjectWe are counsel to the terms and conditions set forth in this Agreement, ​ wishes to sell to ​, and ​ wishes to buy from ​, ​ (the “Company”), and have represented the Company in connection with that certain Purchase Agreement, dated as of October 24, 2016 (the “Purchase Agreement”), entered into by and between the Company and ​ (the “Buyer”) pursuant to which the Company has agreed to issue to the Buyer shares of ​'the Company's common stock,Common Stock, $0.000666001 par value (the “Common Stock”), subjectin an amount up to Five Million Dollars ($5,000,000.00) (the “Put Shares”), in accordance with the terms and conditions of thisthe Purchase Agreement. TheIn connection with the transactions contemplated by the Purchase Agreement, the Company has registered with the U.S. Securities & Exchange Commission the following shares of Common Stock purchased hereunder are referred to herein as the “Purchase Shares.”Stock:

SubjectWe are counsel to the terms and conditions set forth in this Agreement, ​ wishes to sell to ​, and ​ wishes to buy from ​, ​ (the “Company”), and have represented the Company in connection with that certain Purchase Agreement, dated as of March 21, 2017 (the “Purchase Agreement”), entered into by and between the Company and ​ (the “Buyer”) pursuant to which the Company has agreed to issue to the Buyer shares of ​'the Company's common stock,Common Stock, $0.000666001 par value (the “Common Stock”“Common Stock”), subjectin an amount up to Five Million Dollars ($5,000,000.00) (the “Put Shares”), in accordance with the terms and conditions of thisthe Purchase Agreement. TheIn connection with the transactions contemplated by the Purchase Agreement, the Company has registered with the U.S. Securities & Exchange Commission the following shares of Common Stock purchased hereunder are referred to herein as the “Purchase Shares.”Stock: