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Ashizawa, K.; Uchikawa, K.; Hattori, T.; Sato, T.; Miyake, Y., Polymorphic differences in «alpha»- and «beta»-form crystals of 2R, 4S, 6-fluoro-2-methyl-spiro[chroman-4,4'-imidazoline]-2',5-dione (M79175) as determined by x-ray diffraction, infrared spectroscopy, J. Pharm. Sci., 1988, 77, 635. [all data]