hemi-Oxanthromicin A is a polyketide that has been found inStreptomyces.1
1.Salim, A.A., Xiao, X., Cho, K.-J., et al.Rare Streptomyces sp. polyketides as modulators of K-Ras localisationOrg. Biomol. Chem.12(27)4872-4878(2014)