Pseudomonic acid. Part 3. Structure of pseudomonic acid B

Pseudomonic acid B, a minor antibiotic produced by Pseudomonas fluorescens, has been identified as 9-{4-[5-(2,3-epoxy-5-hydroxy-4-methylhexyl)-3,4,5-trihydroxytetrahydropyran-2-yl]-3-methylbut-2-enoyloxy}nonanoic acid from a comparison of spectral data of its derivatives with those of derivatives of pseudomonic acid A.