(+/-)-Carbocyclic-2',3'-dideoxydidehydro-2-amino-6-chloropurinenucleoside (+/-)-cis-(1S,4R)/(1R,4S)-4-[2-amino-6-chloro-9H-purin-9yl]-2-cyclopentene-1-methanol 118237-87-9 AIDS-000266 AIDS000266 NSC613825