The molecule is an aminoglycoside phosphate and an ortho ester. It derives from a hygromycin B. It is a conjugate base of a 4-O-phosphohygromycin B(1+).
[(1R,2R,3S,4R,6S)-2-[(2R,3'R,3aS,4S,4'S,5'R,6R,6'R,7S,7aS)-6'-(1-amino-2-hydroxyethyl)-3',4',5',7-tetrahydroxy-6-(hydroxymethyl)spiro[4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-2,2'-oxane]-4-yl]oxy-4-amino-3-hydroxy-6-(methylamino)cyclohexyl] dihydrogen phosphate