Theophylline, ROTICHROM® HPLC, Molar mass (M) 180,16 g/mol, Density (D) 1,36 g/cm³, Storage temp. +4 °C, CAS No. [58-55-9], UN-Nr. 2811, EG-Nr. 200-385-7, Empirical formula C7H8N4O2