title: Cyclo(l-tyrosyl-l-tryptophanyl) dimethylformamide solvate.
abstract: THE STRUCTURE OF THE TITLE COMPOUND [SYSTEMATIC NAME: (3S,6S)-3-(4-hydroxy-benz-yl)-6-(1H-indol-3-ylmeth-yl)piperazine-2,5-dione dimethyl-formamide solvate], C(20)H(19)N(3)O(3)·C(3)H(7)NO, contains hydrogen-bonded tapes typical for diketopiperazines. The structure is stabilized by strong inter-molecular inter-actions of the types O-H⋯O and N-H⋯O involving the dipeptide and the solvent mol-ecules. The absolute configuration was known from the starting materials.
authors.affiliation: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway.
authors.forename: Carl Henrik
authors.initials: CH
authors.lastname: Görbitz
authors.forename: Lars Male
authors.initials: LM
authors.lastname: Hartviksen