Caerulomycins B and C, new 2,2′-dipyridyl derivatives from Streptomyces caeruleus

Abstract
Three new metabolites were isolated from cultures of S. caeruleus and are related to caerulomycin, a known antibiotic metabolite of this organism now designated caerulomycin A. The structures of 2 of the new compounds, caerulomycins B and C, are 3-hydroxy-4-methoxy- and 3,4-dimethoxy-2,2''-dipyridyl-6-(E)-aldoxime.