The molecule is the streptothricin acid obtained by hydrolysis of the lactam group of streptothricin D. It is a conjugate base of a streptothricin D acid (pH 7.3).
(4S,5S)-2-[[(2R,3R,4S,5R,6R)-3-[[(3S)-3-amino-6-[[(3S)-3-amino-6-[[(3S)-3,6-diaminohexanoyl]amino]hexanoyl]amino]hexanoyl]amino]-5-carbamoyloxy-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]amino]-5-[(1R)-2-amino-1-hydroxyethyl]-4,5-dihydro-1H-imidazole-4-carboxylic acid