4-phenyl-2-thioxo-2,5,6,7-tetrahydro-1H-cyclopenta[b]pyridine-3-carbonitrile
2-cyclopentanespiro-1,3-dithia-4-cyclohexene
4-<4-chlorophenyl>-3-cyano-5,6-trimethylenepyridine-2<1H>-thione
7-Amino-9-(4-chloro-phenyl)-6,10-dithia-spiro[4.5]dec-7-ene-8-carbonitrile
7-Amino-9-(4-bromo-phenyl)-6,10-dithia-spiro[4.5]dec-7-ene-8-carbonitrile