Novo Nordisk earlier this month made a 2.6-billion-euro offer to buy the firm that is developing nano-drugs to treat blood disorders, which Ablynx rejected as too little.
Chief executive Olivier Brandicourt said by acquiring Ablynx that Sanofi will be expanding its portfolio of drugs that are close to market and "strengthening our platform for growth in rare blood disorders."
Ablynx specialises in the development of nanobodies: small fragments of antibodies that like larger antibodies can bind onto the antigens that cause an immune system response.
Ablynx's chief executive Edwin Moses said "we believe Sanofi's global infrastructure, commitment to innovation and commercial capabilities will accelerate our ability to deliver our pipeline" of products under development to the market.
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The purchase of Ablynx is the second major acquisition by Sanofi this month, after announcing last week it would buy US biotech company Bioverativ, which specialises in treatments for haemophilia and rare blood disorders, for USD 11.6 billion (9.4 billion euros).
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