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Stephan, B. and Mannschreck, Albrecht and Voloshin, N. A. and Volbushko, N. V. and Minkin, V. I. (1990) Chiral 2H-Pyrans 1: Separation and photoinduced transformations of the enantiomers of 3′,3′-dimethylspiro[2H-1-benzopyran-2,1′(2)oxaindans]. Tetrahedron Letters 31 (44), pp. 6335-6338.