Drugbank ID: DB03615 (Ribostamycin) Ligand ID: RIO Indication: A broad-spectrum antimicrobial isolated from Streptomyces ribosifidicus. Ribostamycin, along with other aminoglycosides with the DOS (2-deoxystreptamine) subunit, is an important broad-spectrum antibiotic with important use against human immunodeficiency virus and is considered a critically important antimicrobial by the World Health Organization.