lithium (6Z)-4-hydroxy-6-(2-{4-[(2E)-1-hydroxy-2-{(4E)-4-[(2E)-(8-hydroxy-1-oxo-3,6-disulfonaphthalen-2(1H)-ylidene)hydrazinylidene]-3-methoxycyclohexa-2,5-dien-1-ylidene}hydrazinyl]-2-methoxyphenyl}hydrazinylidene)-5-oxo-7-sulfo-5,6-dihydronaphthalene-2-