4-Oxazolecarboxylic acid,2-[4-[3-[[(butylamino)carbonyl]amino]-1-(3,5-disulfophenyl)-1,5-dihydro-5-oxo-4H-pyrazol-4-ylidene]-2-butenylidene]-2,3-dihydro-3-(2-sulfoethyl)-, 4-methyl ester, tripotassium salt
CAS No. 64325-67-3