The main ingredient of this product is low molecular weight heparin calcium (nadroparin calcium), which is a calcium salt of aminodextran (heparin) fragment obtained from the intestinal mucosa. 1ml injection contains low molecular weight heparin calcium 9500IU anti-Xa factor (European Pharmacopoeia unit, equivalent to WHO unit 1025IU anti-Xa factor). Unless otherwise stated, the units used in this manual are European Pharmacopoeia units. Chemical structural formula: Molecular formula: No molecular weight: The average molecular weight is 3600-5000. Excipients: medicinal hydrochloric acid solution or calcium hydroxide solution, water for injection.