ethyl 9,10,11,12-tetrachloro-2,7-dihydro-2,7-epiminobenzo[b][1,4]dioxecine-13-carboxylate

ethyl (1R,5S)-7-phenyl-6-oxa-2,7-diazabicyclo[3.2.2]nona-3,8-diene-2-carboxylate

乙基叠氮基甲酸酯

Ethoxycarbonylnitrene