Abstract
The crystal and molecular structure of a methionyl containing diketopiperazine, cyclo ( l-methionyl- l-methionyl), is reported. The molecule crystallizes in the space group P1 with a = 13.469(2), b=5.304(1), c=4.885(1) Å; α=105.8(1)°, β=99.7(1)°, γ=79.4(1)°; V=327.54 Å 3; Z = 1. The diketopiperazine ring adopts a twist boat conformation (fold angle β= +30°). The packing of the molecules is characterized by hydrogen-bonded ribbons. Circular dichroism measurements gave evidence of a concentration-dependent conformational transition between two conformers having opposite directions of ring folding.
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