21 condensation of 3-methoxyaniline with carbamoylthiocarbonylthioacetic acid (14y yielded the thiooxanilamide 15, which was oxidized with potassium ferricyanide to yield a mixture of amides 16 and 17. Treatment of the amide mixture with phosphorus oxychloride and pyridine yielded the corresponding nitriles, 18 and 19, which were separated and purified by chromatography on silica gel. The isomers were identified by means of their ...