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r 7.12 (s, 3, NCH3), 2.80 and 2.40 (d,/ = 4.5 cps, 1 each, thiazole protons), 1.9-2.2 (m, 4, aromatic protons), a broad, weak peak from -2.0 to -0.6 (2, the enol OH and the NH, exchanges D20); mass spectrum parent ion m/e 337 (caled 337) with major ions of m/e 273, 173, 174, 145, 144, 117, 104, and 100. A sample of 1 gave a deep red-brown color with 5% FeCl3 reagent. A very stable hemichloroform solvate of 1 was isolated when chloroform was used on one occasion to recrystallize 1. Infrared spectra obtained on all compounds in Table II indicated the enol form in every case. All of the compounds gave a deep red color with dilute FeCl3 solution.

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