The molecule is dianion of oxidized Watasenia luciferin arising from deprotonation of both sulfate OH groups; major species at pH 7.3. It is a conjugate base of an oxidized Watasenia luciferin.
[4-[6-benzyl-5-[[2-(4-sulfonatooxyphenyl)acetyl]amino]pyrazin-2-yl]phenyl] sulfate