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5-vinyl-4,5-dihydro-oxazole-4-carboxylic acid ethyl ester 5-vinyl-4,5-dihydrooxazole-4-carboxylic acid ethyl ester ethyl 5-ethenyl-4,5-dihydro-1,3-oxazole-4-carboxylate ethyl 5-ethenyl-4,5-dihydro-1,3-oxazol-4-carboxylat éthyle5-éthenyl-4,5-dihydro-1,3-oxazole-4-carboxylate エチル=5-エテニル-4,5-ジヒドロ-1,3-オキサゾール-4-カルボキシラ
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