or other comparable courier providing proof of delivery, and shall be deemed duly given and received (i) if mailed, on the third business day following the mailing thereof, or (ii) if sent by courier, the date of its receipt (or if not on a business day, the next succeeding business day). If to HEMISPHERX: Thomas K. Equels, President and CEO One Penn Center 1617 JFK Boulevard Suite 500 Philadelphia, PA 19103 United States If to SCIEN: Abdelrhman Mofeed Zhreldin Business Development Manager Scientific Products Pharmaceutical Co. Ltd Tahlia Street, P.O Box 10485, Riyadh 11433 Saudi Arabia B. This Agreement and the transactions contemplated herein shall be governed by, and construed in accordance with, the laws of the State of Delaware, USA and disputes, if not resolved by the Parties, will be settled by binding arbitration in and under the rules of arbitration in London, England. C. This Agreement constitutes the entire understanding of the parties with respect to the purchase and sale of Products and supersedes all prior discussions, agreements, and understandings between HEMISPHERX and SCIEN. D. Each party an independent contractor to the other and the relationship between the parties shall not be construed to be that of an employer and employee, or to constitute a partnership, joint venture, or agency of any kind. E. This Agreement may only be amended in a writing signed by both parties hereto. F. If any provision of this Agreement is declared invalid or unenforceable by a court having competent jurisdiction, it is mutually agreed that this Agreement shall endure except for the part declared invalid or unenforceable by order of such court. G. This Agreement may be executed in one or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same