The molecule is an organic cation obtained by protonation of the five amino groups of tobramycin. It is an ammonium ion derivative and an organic cation. It is a conjugate acid of a tobramycin.
[(1S,2R,3S,4S,5R)-5-azaniumyl-2-[(2R,3R,5S,6R)-3-azaniumyl-6-(azaniumylmethyl)-5-hydroxyoxan-2-yl]oxy-4-[(2S,3R,4S,5S,6R)-4-azaniumyl-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3-hydroxycyclohexyl]azanium