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3-(6-methoxy-3-nitro-pyridin-2-yl)-2-oxo-propionic acid ethyl ester
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5-甲氧基-4-氮杂吲哚-2-乙基羧酸
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5-甲氧基-1H-吡咯并[3,2-b]吡啶-2-羧酸