131959-74-5 17.beta.-Hydroxy-4-aza-A-homo-5.alpha.-androstan-3-one p-[N,N-bis(2-chloroethyl)amino]phenylbutyrate 4-Aza-A-homoandrostan-3-one, 17-[4-[4-[bis(2-chloroethyl)amino]phenyl]-1-oxobutoxy]-, (5a,17b)- AIDS-001698 AIDS001698 Homo-aza-steroidal ester NSC622555