exhibit 10. 4 valinhos, july 14th., 2021. to : irach taraporewala, ph. d chief executive officer & director commercial proposal : azd. br. eom _ 063 - 2021 – r03 reference : commercial proposal for the regulatory, scientific and management services of a proof – of – concept study evaluating safety, tolerability, and preliminary efficacy of eom - 613 in covid - 19 infected patients with severe symptoms. dear irach, thank you for the opportunity to prepare this commercial proposal. if you have any questions, please do not hesitate to contact us. sincerely, dra. luciana bortolassi ferrara ceo azidus brasil azidus brasil - rua general osorio, 507 - vila martina - cep. 13271 - 130 - valinhos / sp - tel. + 55 19 3829 - 6160www. azidusbrasil. com. br1 of 20 azidus brasil - rua general osorio, 507 - vila martina - cep. 13271 - 130 - valinhos / sp - tel. + 55 19 3829 - 6160www. azidusbrasil. com. br1 of 20 azidus brasil - rua general osorio, 507 - vila martina - cep. 13271 - 130 - valinhos / sp - tel. + 55 19 3829 - 6160www. azidusbrasil. com. br1 of 20 azidus brasil - rua general osorio, 507 - vila martina - cep. 13271 - 130 - valinhos / sp - tel. + 55 19 3829 - 6160www. azidusbrasil. com. br azidus brasil - rua general osorio, 507 - vila martina - cep. 13271 - 130 - valinhos / sp - tel. + 55 19 3829 - 6160 www. azidusbrasil. com. br 1 of 20 1. about azidus 1. about azidus 1. about azidus azidus is a cro ( contract research organization ) that offers comprehensive services and solutions for the development and registration of medicines, health products, cosmetics and food in the world ’ s leading regulatory agencies. the 20 - year experience in the market associated with a highly