(3E)-5-hydroxy-6-(1-oxido-3,4-dihydro-2H-pyrrol-2-yl)-3-hexen-2-one
(E)-5-hydroxy-6-(1-oxido-3,4-dihydro-2H-pyrrol-1-ium-2-yl)-hex-3-en-2-one (E)-5-hydroxy-6-(1-oxido-1-pyrrolin-1-ium-2-yl)hex-3-en-2-one (E)-5-hydroxy-6-(1-oxido-3,4-dihydro-2H-pyrrol-1-ium-2-yl)hex-3-en-2-one
(E)-5-hydroxy-6-(1-oxido-3,4-dihydro-2H-pyrrol-1-ium-2-yl)hex-3-en-2-on (E)-5-ヒドロキシ-6-(1-オキシド-3,4-ジヒドロ-2H-ピロル-1-イウム-2-イル)
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