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https://www.smolecule.com/products/s3321057 Buy 3,4-diphenyl-1H-pyrrole-2,5-dione | 31295-36-0 Buy 3,4-diphenyl-1H-pyrrole-2,5-dione, CAS No. 31295-36-0 from Smolecule. Molecular Formula C16H11NO2. Molecular Weight 249.26 g/mol.