3-(4-Methoxyphenyl)-1-methylene-2-phenyl-1,2-dihydropyrazino[1,2-a]benzimidazole AIDS-150396 AIDS150396 Methyl 4-(1-methylene-2-phenyl-1,2-dihydropyrazino[1,2-a]benzimidazol-3-yl)phenyl ether NSC687527