6962-42-1

(3Z)-4-oxo-3-({4-[(E)-2-{4-[(2E)-2-(1-oxo-4-sulfonaphthalen-2(1H)-ylidene)hydrazino]-2-sulfophenyl}ethenyl]-3-sulfophenyl}hydrazono)-3,4-dihydronaphthalene-1-sulfonic acid