130771-42-5 134309-68-5 (R) 134355-17-2 (S) 3'-Azido-3'-deoxythymidine-5'-(ethyl propylamino)phosphoramidate AIDS-002292 AIDS002292 PrNHPO3(Et)AZT Thymidine, 3'-azido-3'-deoxy-, 5'-(ethyl propylphosphoramidate)