KATSUO KATO, ISAO KAWADA UND TATSUO TAKAHASHI 3443 den unter Annahme dieses Atomformfaktors verfeinerten Angleichungsfaktoren ffir die Reflexgruppen mit k -0(mod 3) und k ---0(rood 5) steht mit dem experimentell ermittelten Weft im Einklang. Die aus dem obengenannten 'Zellinhalt' errechnete Dichte betriigt 4,53 g cm -3 und stimmt mit dem von Takahashi et al. (1971) Glycyrrhetinic acid acetone monohydrate (1 : 1 : 1) crystallizes in the orthorhombic space group P21212 with a = 11.541, b = 36.328, c = 7-406 A. The crystal structure was solved by direct methods and refined to R = 0.057 for 2573 reflexions. All the molecules are linked together by hydrogen bonds; water plays a particularly important role in the crystal packing. Conformational similarities between glycyrrhetinic acid and mineralocorticoids are emphasized.
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