Monographs: Pharmaceutical substances: Tenofoviri disoproxili fumaras - Tenofovir disoproxil fumarateC19H30N5O10P,C4H4O4Relative molecular mass. 635.5Chemical name. 1,1-bis(1-methylethyl) 1,1-(1R)-2-(6-amino-9H-purin-9-yl)-1-methylethoxymethylphosphonoyldioxy)dimethyl dicarbonate (ester) hydrogen (2E)-but-2-enedioate (salt); CAS Reg.No. 202138-50-9.Description. White to almost-white, crystalline powder.Solubility. Slightly soluble in water, soluble in methanol, very slightly