A mimic of a plausible biosynthetic intermediate of bishomononactic acid, one of the monomers of macrotetrolide antibiotics (polynactin), was synthesized as a thiol ester. FAB-MS analysis showed that fermentation of polynactin producing Streptomyces griseus with the compound, afforded the unnatural polynactins containing bishomononactic acid(s).
The new radical scavenger 12T061C (C20H22O7) has been identified from a culture of Streptomyces species. Spectroscopic elucidation showed that this compound is a new Julichrome family compound. 12T061C shows a potent radical-scavenging activity with an ED50 of 18 μm that is similar to those of the known antioxidant compounds α-tocopherol (ED50 16 μm) and quercetin (ED50 3 μm).