4′-(4-Methoxy-2-nitrophenyl)-4′-azaspiro[cyclopropane-1,10′-tricyclo[5.2.1.0~2,6~]decane]-8′-ene-3′,5′-dione

4′-(4-Methoxy-2-nitrophenyl)-4′-azaspiro[cyclopropane-1,10′-tricyclo[5.2.1.0~2,6~]decane]-8′-ene-3′,5′-dione

2-(4-methoxy-2-nitrophenyl)-3a,4,7,7a-tetrahydro-1H-spiro[2-aza-4,7-methanoisoindole-8,1′-cyclopropane]-1,3(2H)-dione

7-(4-methoxy-2-nitrophenyl)-7-azaspiro[cyclopropane-1,10′-tricyclo[5.2.1.0<2,6>]decane]-11-ene-6,8-dione