Open Accesscyclo {[(6‐Amino‐6‐deoxy‐2,3:4,5‐di‐ O ‐isopropylidene‐ d ‐galactonic acid)‐( d ‐Phe)] 2 }
Author(s) -
Bream Richard,
Watkin David,
Soengas Raquel,
Fleet George W. J.,
Edwards Alison A.,
Hunter Stuart J.,
Tranter George E.
Publication year - 2006
Publication title -
acta crystallographica section e
Language(s) - English
Resource type - Journals
ISSN - 1600-5368
DOI - 10.1107/s1600536806012487
Subject(s) - tetramer , molecule , stereocenter , chemistry , crystal structure , stereochemistry , crystallography , enantioselective synthesis , organic chemistry , enzyme , catalysis , biochemistry
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], C 42 H 56 N 4 O 12 , 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.