413597-67-8
ethyl 1-{[(tert-butyloxy)carbonyl]amino}-3-hydroxycyclobutane-1-carboxylate
→
~80%
129287-91-8
1-氨基-3-氧代环丁烷-1-羧酸乙酯
54166-15-3
3-苄氧基环丁烷-1,1-二甲酸二乙酯