Fortimicins C, D and KE, new aminoglycoside antibiotics.

Abstract
Three new aminoglycoside antibiotics were isolated from the fermentation broth of Micromonospora olivoasterospora CS-26 that produced fortimicins A and B: fortimicins C, D and KE. Fortimicins C and D exhibited potent, broad spectrum anti-bacterial activities against gram-positive and negative bacteria while fortimicin KE was only weakly active.