Phenolphthalein (C.I. 764) ROTI®CALIPURE, Melting point standard 258-263 °C, Molar mass (M) 318,33 g/mol, Density (D) 1,3 g/cm³, Boiling point (bp) >450 °C, CAS No. [77-09-8], EG-Nr. 201-004-7, Empirical formula C20H14O4