4-(Ethoxycarbonyl)-1-oxo-1,5-dihydropyrido[1,2-a]benzimidazole-2-carboxylic acid AIDS-132595 AIDS132595 NSC626922 {2-Carboxy-4-ethoxycarbonyl-1-oxo-1H,5H-pyrido[1,2-a]benaimidazole}