Not Less Than - 95%
Fumaric acid compound with ((((((R)-1-(6-amino-9H-purin-9-yl)propan-2-yl)oxy)methyl)(hydroxy)phosphoryl)oxy)methyl isopropyl carbonate (1:1); ({[(R)-1-(6-Amino-9H-purin-9-yl)propan-2-yloxy]methyl}(hydroxy) phosphoryl oxy)methyl isopropyl carbonate Fumarate; 2,4,7-Trioxa-5-phosphanonanoic acid, 9-(6-amino-9H-purin-9-yl)-5-hydroxy-8-methyl-, 1-methylethyl ester, 5-oxide, (8R)-, (2E)-2-butenedioate (1:1);