Chrolactomycins from the actinomycete actinospica.

Examination of the metabolites produced by an Actinospica strain led to the identification of 6-hydroxychrolactomycin (compound 1), which is produced along with minor amounts of chrolactomycin (compound 2). The structure of 1 was established on the basis of extensive spectroscopic analysis, including one- and two-dimensional NMR. Compound 1 showed antimicrobial activity against Gram-positive bacteria, although it was generally less active than 2.