The molecule is an organic cation obtained by protonation of the four free amino groups and deprotonation of the phosphate OH groups of 5''-phosphoribostamycin; major species at pH 7.3. It is an organic cation and an ammonium ion derivative. It derives from a ribostamycin(4+). It is a conjugate acid of a 5''-phosphoribostamycin.
[(2R,3S,4R,5S)-5-[(1R,2R,3S,5R,6S)-3,5-bis(azaniumyl)-2-[(2R,3R,4R,5S,6R)-3-azaniumyl-6-(azaniumylmethyl)-4,5-dihydroxyoxan-2-yl]oxy-6-hydroxycyclohexyl]oxy-3,4-dihydroxyoxolan-2-yl]methyl phosphate