A crystallographic study of phompsin A, the hexapeptide mycotoxin of Phomopsis leptostromiformis responsible for lupinosis disease in animals, has shown that it is a linear peptide, modified by an ether bridge in place of the hydroxy groups of the N-methyl-3-(3-chloro-4,5-dihydroxyphenyl)-3-hydroxyalanine and 3-hydroxyisoleucine units, and thus containing a 13-membered ring.
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Mackay et al. (1986) studied this question.