2-(4-Methoxyphenyl)-1-methylene-3-(4-methylphenyl)-1,2-dihydropyrazino[1,2-a]benzimidazole AIDS-150395 AIDS150395 Methyl 4-(1-methylene-3-(4-methylphenyl)pyrazino[1,2-a]benzimidazol-2(1H)-yl)phenyl ether NSC687526