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Figure 1
The zwitterionic mol­ecular structure of (I)[link], showing the atom-numbering scheme. Displacement ellipsoids are shown at the 50% probability level. Only main-chain atoms N1, C11/C12 (constrained to have the same set of coordinates), C4 and O1 are unaffected by disorder. In the electronic version of the paper, for the Abu side chain, the two alternative positions, each with occupancy 0.5, are shown in light blue and green, respectively. For the C-terminal part, three alternative side-chain orientations are shown in dark colours for component 1 (occupancy 0.5, atom names Xn1), grey/violet for component 2 [occupancy 0.299 (9)] and light grey/orange for component 3 [occupancy 0.201 (9)], with methyl­ene H atoms omitted. For the main chain, only component 1 is included due to extensive overlap.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 69| Part 8| July 2013| Pages 888-891
doi:10.1107/S0108270113017484
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