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methyl 4-(chloromethyl)pyridine-2-carboxylate Methyl 4-bromo-1H-indazole-6-carboxylate methyl 4-(chlorosulfonyl)-2-fluorobenzoate Dimethyl 2,4-pyridinedicarboxylate 7,9-DIMETHOXYCARBONYL-2-ETHOXYCARBONYL-5-METHOXY-1H-PYRROLO-[2,3-F]QUINOLINE 7,9-DIMETHOXYCARBONYL-2-ETHOXYCARBONYL-1H-PYRROLO-[2,3-F]QUINOLINE-4,5-DIONE 2-(ETHOXYCARBONYL)ISONICOTINIC ACID