bis-indole alkaloid with antibiotic activity dragmacidin F ARO:3007778 antibiotic_resistance PubChem:459934 ChEMBL:CHEMBL4079851 Spongosorites has yielded a bis-indole alkaloid which we have named dragmacidin G. Dragmacidin G is the first in this series of compounds to have a pyrazine ring linking the two indole rings. It also has a rare N-(2-mercaptoethyl)-guanidine side chain. Dragmacidin G shows a broad spectrum of biological activity including inhibition of methicillin-resistant Staphylococcus aureus, Mycobacterium tuberculosis, Plasmodium falciparum, and a panel of pancreatic cancer cell lines.