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4-Methoxybut-2-enoic acid: BD0081834175933-65-297%; ￥3442.01g

(E)-4-methoxybut-3-en-2-one: BD20623951731-17-090% GC; ￥72.05g

(E)-Methyl 4-chloro-3-methoxybut-2-enoate: BD137819110104-60-495%; ￥31.01g

4-Methoxybut-3-en-2-one: BD984184652-27-190%; ￥838.0100g

(E)-4-Methoxybut-2-enoic acid: BD25022963968-74-198%; ￥66.01g

(E)-Methyl 4-methoxybut-2-enoate: BD0098584113168-99-597%; ￥58.01g

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