... ,CatechinsAppearance: Brown Fine PowderMolecular Formula:C22H18O11(EGCG), C15H14O7 (EGC), C22H18O10(ECG), C15H14O6(EC)Molecular Weight: 458.4CAS NO.: 989-51-5 ... (EGCG), 970-74-1(EGC), 1257-08-5 (ECG),490-46-0 (EC)Test method: HPLC SpecificationsGreen Tea Extract ...