Abstract
The crystal structure of the chloride salt of H3N(+)-cyclo-(Phe(4-O)-Phe-Phe(3-O)-OMe, cyclo-phenylalanyl-phenylalanyl-phenylalaninium chloride methyl esther, C28H30N3O5+.Cl(-), is described. It is oxidatively linked through a biaryl ether linkage formed from the hydroxyl of 4-hydroxyphenylalanine and the meta position of the distal phenylalanine residue. This is the first reported crystal-structure determination of a cyclic 17-membered biphenyl ether tripeptide, a class which includes the natural products K-13 and OF4949 I-IV. An unusual C-H...O hydrogen bond is formed between the methine H atom of the N-terminal C alpha and a carbonyl-O atom of a neighboring molecule [C...O = 2.995 (4) A].
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Schedule a callMore From: Acta crystallographica. Section C, Crystal structure communications
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