Standards; Chiral Molecules; Enzyme Activators and Inhibitors; Pharmaceutical/API Drug Impurities/Metabolites;
Antitumor alkaloid. Binds irreversible to the DNA-topoisomerase I complex, inhibiting the reassociation of DNA after cleavage by topoisomerase I and traps the enzyme in a covalent linkage with DNA. A cytotoxic antitumor agent.