8-Benzyl-1c,6c-dimethoxycarbonyl-3,4-benzo-8-azabicyclo[4.3.1]dec-3-en-2,5-dion

5-deuterio-1-methoxycarbonylquadricyclan-3-one

5-deuterio-3-isopropylidene-1-methoxycarbonylquadricyclane

7,8-dichlorobicyclo(4.2.0)octa-2,4-diene

(2,3-dicarbomethoxy-7-(carbethoxy)-7-azanorbornadiene)tricarbonyliron