The crystal structure of the title compound has been determined by the heavy-atom method from a three-dimensional X-ray diffraction study. Least-squares refinement, based on 1 1 1 9 visually estimated independent reflections, has reduced R to 0.1 09. Crystals are orthorhombic, a = 7.74(4), b = 13.78(3), c = 14.81 (3) 8, space group PZ12,2, and Z = 4.In the complex the peptide molecule behaves as a terdentate chelate via its terminal amino-group, peptide nitrogen atom, and the carboxylate ion. The single peptide nitrogen is deprotonated. The Curl atom has co-ordination number 4, the peptide atoms and one water molecule forming an approximate square.TRYPTOPHAN is one of the naturally occurring aminoacids. It is a precursor of neurochemically important compounds and chemically related to a group of psychopharmaca. Several structure determinations of tryptophan derivatives have been carriedThe present X-ray analysis was undertaken since the title complex is the first-reported metal-peptide structure in which one of the peptide residues is tryptophan. A preliminary account has been published.6 EXPERIMENTAL A deep blue solution of the title complex was prepared by reaction of equimolar amounts of either (a) freshly precipi-

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