The molecule is an organic anion obtained by removal of the acidic proton from position 8 of mitomycin B. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of a mitomycin B.
(4S,6S,7R)-8-(carbamoyloxymethyl)-7-hydroxy-11-methoxy-5,12-dimethyl-10-oxo-2,5-diazatetracyclo[7.4.0.02,7.04,6]trideca-1(13),8,11-trien-13-olate