3,3-Dimethyl-8-phenyl-6,7,9,10-tetraaza-spiro[4.5]dec-7-en-1-one

7,8-Dichloro-3-phenyl-1,8a-dihydro-2H-pyrrolo[1,2-b][1,2,4,5]tetrazin-6-one

4-Amino-5-oxo-3-phenyl-4,5-dihydro-[1,2,4]triazine-6-carboxylic acid methyl ester

(3aZ,6Z,8E,11aZ,14Z,16E)-2,2,10,10-Tetramethyl-6,14-diphenyl-1,2,3,5,9,10,11,13-octahydro-4,5,7,8,12,13,15,16-octaaza-dicyclopenta[a,h]cyclotetradecene

3-Phenyl-1,10b-dihydro-2H-[1,2,4,5]tetrazino[6,1-a]isoindol-6-one