3-phenyl-4-{[(7(9)H-purin-6-yl)-hydrazono]-methyl}-sydnone

(E)-1-Phenylpyrazolo<3,4,-g>-tricyclo<4.4.1.01.6>undeca-3,7,9-trien-2,5-dion-2-N-methyl-(4-nitrophenyl)hydrazon

3-(2-(4-bromophenylethynyl)phenyl)sydnone

(Z)-1-Phenylpyrazolo<3,4-c>-bicyclo<4.4.1>undeca-3,6,8,10-tetraen-2,5-dion-2-(4-nitrophenyl)hydrazon

3-phenyl-4-vinylsydnone