2,6b-Dihydroxy-4a,6a-dimethyl-8-oxo-2,3,4,4a,4b,5,6,6a,6b,7,8,9,11,11a,11b,12-hexadecahydro-1H-naphtho[2',1':4,5]indeno[1,2-b]pyridine-9-carbonitrile AIDS-127526 AIDS127526 NSC167882