4-[[(Z)-[7-[(8Z)-8-[[(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)amino]methylidene]-1,6-dihydroxy-3-methyl-7-oxo-5-propan-2-ylnaphthalen-2-yl]-3,8-dihydroxy-6-methyl-2-oxo-4-propan-2-ylnaphthalen-1-ylidene]methyl]amino]-1,5-dimethyl-2-phenylpyrazol-3-one