3H-Pyrazol-3-one, 2,4-dihydro-4-((4,5-dihydro-5-oxo-1,3-diphenyl-1H-pyrazol-4-yl)methylene)-2,5-diphenyl- 4,4'-Methenyl-bis-(1,3-diphenyl-pyrazolon-(5)) [German] 5584-31-6 BRN 1233315