Acta Cryst. (2006). E62, o1851-o1853  [ doi:10.1107/S1600536806012487 ]

cyclo{[(6-Amino-6-deoxy-2,3:4,5-di-O-isopropylidene-D-galactonic acid)-(D-Phe)]₂}

R. Bream, D. Watkin, R. Soengas, G. W. J. Fleet, A. A. Edwards, S. J. Hunter and G. E. Tranter

Abstract: Determination of the crystal structure of the title compound [systematic name: 9,25-dibenzyl-4,4,15,15,20,20,31,31-octamethyl-3,5,14,16,19,21,30,32-octaoxa-8,11,24,27-tetraazapentacyclo[27.3.0.0^2,6.0^13,17.0^18,22]dotriacontane-7,10,23,26-tetrone], C₄₂H₅₆N₄O₁₂, a cyclic tetramer, established the relative stereochemistry of its ten stereogenic C atoms; an interesting saddle-like conformation is adopted. There are two molecules in the asymmetric unit. With the exception of the phenyl and isopropylidene groups, the molecules are related by a non-crystallographic twofold rotation axis. There are varying degrees of disorder in the isopropylidene groups.

Online 13 April 2006

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