2-Amino-4-(4-chlorophenyl)-11-(4-fluorophenyl)-10-oxo-7,8,9,11,11a-pentahydropyrano[2,3-d]quinazolino[2,3-b]1,3-thiazoline-3-carbonitrile AIDS-097158 AIDS097158 Thiazolo[2,3-b]quinazoline analog