Citation: Vp. Rybalkin et al., BENZOID-QUINOID TAUTOMERISM OF AZOMETHINE S AND THEIR STRUCTURAL ANALOGS .48. TAUTOMERISM AND PHOTOCHROMISM OF OXYPHENYLAMINOMETHYLENE)-3(2H)-BENZO[B]THIOPHENONE AND ITS ACETYL DERIVATIVES, ZH ORG KH, 28(11), 1992, pp. 2310-2315