The molecule is an organic cation obtained by protonation of the four free amino groups of amikacin; major species at pH 7.3. It is an ammonium ion derivative and an organic cation. It is a conjugate acid of an amikacin.
[(2R,3S,4S,5R,6R)-6-[(1R,2S,3S,4R,6S)-6-azaniumyl-3-[(2S,3R,4S,5S,6R)-4-azaniumyl-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-[[(2S)-4-azaniumyl-2-hydroxybutanoyl]amino]-2-hydroxycyclohexyl]oxy-3,4,5-trihydroxyoxan-2-yl]methylazanium