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2Synthesis of (5Z,5??Z)-3,3??-(alkane-??,??-diyl)bis[5-(2-pyridylmethylidene)-2-methylthio-3,5-dihydro-4H-imidazol-4-ones] and their coordination compounds with copper(ii), Russian Chemical Bulletin Synthesis of isomeric 3-phenyl-5-(pyridylmethylene)-2-thiohydantoins and their S-methylated derivatives. Molecular and crystal structures of (5Z)-3-phenyl-5-(pyridin-2-ylmethylene)-2-thiohydantoin and (5Z)-2-methylthio-3-phenyl-5-(pyridin-2-ylmethylene)-3,5-dihydro-4H-imidazol-4-one, Russian Chemical Bulletin