5-(chloromethyl)-1-(4-hydroxyphenyl)-3-(4-isocyano-3-methylphenyl)-5-methylchloranuidyl-2-sulfanylideneimidazolidin-4-one;ethyl (E)-3-[4-[7-(4-isocyano-3-methylphenyl)-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-5-yl]phenyl]prop-2-enoate;1-(4-hydroxyphenyl)-3-(4-isocyano-3-methylphenyl)-5,5-dimethylimidazolidine-2,4-dione;3-(4-isocyano-3-methylphenyl)-5,5-dimethyl-1-(4-methyl-2-pyridinyl)-2-sulfanylideneimidazolidin-4-one;3-(4-isocyano-3-methylphenyl)-5,5-dimethyl-1-pyridin-2-yl-2-sulfanylideneimidazolidin-4-one;(E)-3-[4-[7-(4-isocyano-3-methylphenyl)-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-5-yl]phenyl]prop-2-enoic acid