The molecule is an organic cation obtained by protonation of the secondary amino group of acarbose; major species at pH 7.3. It is an ammonium ion derivative and an organic cation. It is a conjugate acid of an acarbose.
[(2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6R)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2R,3S,4R,5R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-methyloxan-3-yl]-[(1S,4R,5S,6S)-4,5,6-trihydroxy-3-(hydroxymethyl)cyclohex-2-en-1-yl]azanium