104704-57-6
2-benzyloxycarbonyl-3-phenyl-2-azabicyclo[2.2.0]hexa-5-ene
→
106895-31-2
7-phenyl-3-oxa-6-azatricyclo[3.2.0.02,4]hept-6-ene
104704-63-4
3-benzyloxycarbonyl-4-phenyl-3-aza-7-oxatricyclo[4.1.0.02.5]heptane