1,2,3,4-Butanetetrol, 1-(6-amino-1H-purin-8-yl)-, {[1S-(1R*,2R*,} 3S*)\]- 1-(6-Amino-9H-purin-8-yl)-1,2,3,4-butanetetrol 53176-78-6 AIDS-129189 AIDS129189 NSC335603