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.

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