Crystals of fl-glucoheptonic acid 7-1actone, prepared by recrystallization of the commercial compound from water, were found to be orthorhombic with a o = 7-61, b o = 17-25, c o = 6-60 A (all ±0-02 A).
X-ray diffraction powder data were obtained as part of an effort to characterize a number of substituted 1,3,4oxadiazoles physically. The diffraction data for fourteen of these are presented for the benefit of others interested in the compounds and in a convenient and specific means of their identification.
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