The total structure of cerexin A. Studies on antibiotics from the genus Bacillus. XVI.

Abstract
The constituent fatty acid of cerexin A [an antibacterial agent] was elucidated to be .beta.-hydroxy isoundecanoic acid by gas chromatography, mass spectrometry and NMR. The asparaginyl asparagine linkage in the amino acid sequence of the antibiotic, which was previously described, was proved to be a normal .alpha.-carboxylpeptide bond by dehydration-reduction procedure. The 3 asparagine residues in the sequence were isolated separately and their chiralities were determined. The structure of cerexin A was concluded from the above results.