上游原料
6-Chloro-9H-purin-2-amine; 6-Chloro-9H-purin-2-ylamine; 2-Amino-6-chloropurineethyl (2R)-4-bromo-2-hydroxybutanoateethyl (2R)-4-(2-amino-6-chloro-9H-purin-9-yl)-2-hydroxybutanoate(2R)-4-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-2-hydroxybutyric acidethyl (2R)-4-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-2-hydroxybutanoate