5a,7a,8-Trimethyl-4,5,5a,5b,6,7,7a,8,9,10,11,11a,11b,12,13,13a-hexadecahydro[1,2,5]oxadiazolo[3',4':5,6]naphtho[2,1-f]quinoline AIDS-133950 AIDS133950 NSC631068 {17a-Methyl-17a-aza-D-homo-5-.alpha.-androstano[3,4-c]-} 1',2', 5'-oxadiazole