China Manufacturer Supplying High Quality 8-Bromo-7- (but-2-ynyl) -3-Methyl-1h-Purine-2, 6 (3H, 7H) -Dione with CAS: 666816-98-4, Find details about China Intermediate, Pharmaceutical Intermediate from Manufacturer Supplying High Quality 8-Bromo-7- (but-2-ynyl) -3-Methyl-1h-Purine-2, 6 (3H, 7H) -Dione with CAS: 666816-98-4