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The biosynthesis of pyralomicin 1a (1) was studied by feeding of 13C and 15N labeled compounds to the culture of Microtetraspora spiralis MI178-34F18. The result indicated that the benzopyranopyrrole unit of 1 was derived from two units of acetate, one unit of propionate and one unit of proline, and that the cyclitol unit of 1 was derived from glucose metabolites. And 4'-O-CH3 was derived from the S-CH3 group of methionine.

Pyralomicins, Novel Antibiotics from Microtetraspora spiralis. III. Biosynthesis of Pyralomicin 1a.