55648-40-3 9-beta-D-Arabinofuranosyladenine 5'-formate 9H-Purin-6-amine, 9-(5-O-formyl-beta-D-arabinofuranosyl)- (9CI) 9beta-D-Arabinofuranoxyladenine 5'-formate Arabinosyladenine 5'-O-formate ester NSC 171240