30113-77-0
→
~87%
672-67-3
2H-吡喃-2-酮-6-羧酸
129363-87-7
~30%
874531-13-2
5-oxo-hex-2-enedioic acid diethyl ester
504-31-4
2H-吡喃-2-酮
19621-92-2
6-羟基吡啶-2-羧酸
75611-67-5
6-oxopyran-2-carbonyl chloride
68160-93-0
methyl 6-oxopyran-2-carboxylate