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(E)-4-methoxy-4-oxobut-2-enoic acid
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(E)-4-methoxybut-3-en-2-one
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(E)-4-methylhept-4-en-3-ol
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(E)-4-methylhex-2-ene
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(E)-4-methylpent-2-enal
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(E)-4-methylpent-2-ene
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(E)-4-methylpent-2-enoic acid
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(E)-4-oxo-4-phenylbut-2-enoic acid
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(E)-4-oxo-4-propan-2-yloxybut-2-enoic acid
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