Fortimicin C is an antibiotic , which can be isolated from Micromonospora olivoasterospora. Fortimicin C exhibits broad-spectrum antibacterial activity, inhibits Escherichia coli , Staphylococcus aureus , Bacillus subtilis , Klebsiella pneumoniae , Salmonella typhosa and Serratia marcescens , with MIC s of 0.16-0.64 μg/mL. Fortimicin C is resistant against aminoglycoside inactivating enzymes.