Abstract
The dipeptide, l‐tyrosyl‐l‐phenylalanine (C18H20N2O4, molecular weight = 346) crystallizes as a monohydrate in the orthorhombic system, space group P212121 with a = 5.744(2), b = 8.284(2), c = 35.518(6)Å, Z = 4. The structure was solved by direct methods and refined to a final R‐index of 0.060. The peptide unit is trans and planar, and makes a dihedral angle of 93° with the plane of the carboxyl group. The backbone torsion angles are given by: ø1 = 164.7°, ω1 = 177.0°, φ2 = – 70.1°, ø2 = 146.6°. The values of the side‐chain torsion angles (χ1, χ2) are (47.3°, 79.9°) for tyrosine and (– 75.1°, 75.9°) for phenylalanine. The planes of the two (side‐chain) aromatic rings make a dihedral angle of 142.6° and their centres are separated by 9.3 Å.
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