3,3'-Diaminodiphenyl sulfone, min. 99 %, for synthesis, Molar mass (M) 248,29 g/mol, Density (D) 1,4 g/cm³, CAS No. [599-61-1], UN-Nr. 3077, EG-Nr. 209-967-5, Empirical formula C12H12N2O2S2