134250-28-5 (R) 134250-43-4 (S) 3'-Azido-3'-deoxythymidine-5'-(ethyl methoxy-5-aminovaleryl)phosphoramidate AIDS-002290 AIDS002290 Thymidine, 3'-azido-3'-deoxy-, 5'-[ethyl (5-methoxy-5-oxopentyl)phosphoramidate],-