107788-21-6 3,5-Pyrazolidinedione, 4-((3,4-dihydroxy-5-((phenylthio)methyl)phenyl)methylene)-1-phenyl- 4-((3,4-Dihydroxy-5-((phenylthio)methyl)phenyl)methylene)-1-phenyl-3,5-pyrazolidinedione