105198-41-2
ethyl cis/trans-7-hydroxy-2-heptenoate
→
131373-86-9
ethyl 6-chlorocarbonylhex-2-enoate
20826-94-2
2-氧代环戊基乙酸乙酯
131373-88-1
(Z)-ethyl (2-oxocyclopentylidene)acetate
131373-89-2
(E)-ethyl (2-oxocyclopentylidene)acetate