The synthesis of the cycloheptapeptide 7α (Fig. 4) containing the α,γ‐diaminobutyric acid residues only in the L form, and its cristallization as pentaphosphate are reported. This latter substance proved to be in all respects identical with the cristalline penta‐ phosphate of natural polymyxine B1.
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Vogler et al. (1965) studied this question.
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