4-phenyl-5-phenylimino-1,2,4-dithiazolidine-3-thione

N-(4-ethyl-phenyl)-N'-phenyl-thiourea

N',N'''-diphenyl-N,N''-(4-methyl-m-phenylene)-bis-thiourea

N-phenyl-N',N''-di-o-tolyl-guanidine

1-(4-methylphenyl)-3-phenylthiourea