Purity ~95% by HPLC. O-deacetyl-ravidomycin is the more active and stable analogue of the ravidomycin complex produced by Streptomyces ravidus. The metabolite shows potent, light dependent antitumour activity. Microbial Screening Technologies in-house bioassays detected weak antibacterial and antifungal activity. O-Deacetyl-ravidomycin, like the related gilvocarcins and chrysomycins, is thought to act as a topoisomerase II inhibitor. Solubility: Soluble in DMF or DMSO. Moderately soluble in methanol or ethanol.