Chemical Formula: H2B1a:C49H77NO13 C7H6O2 H2B1b:C48H75NO13 C7H6O2 Molecular weight:B1a:1010 B1b:996 Character: White or yellowish-white, crystalline powder, It melts at 141 centigrade ~146 centigrade , soluble in acetone and in methanol, slightly soluble in water, insoluble in hexalkyl. Standard: Emamestin Benzoate H2B1a + H2B1b not less than 95.0%(anhydrous and solvent-free substance). Ratio H2B1a/H2B1a+ H2B1b minium 90.0%. pH: 5.0~7.0 Storage: Store in an airtight container, protected from light. Period of Validity: Two Year Packing: 1kg/Tin,5kg/Tin