Coumarins

Powerful anti-coagulant plant chemicals. Used to prevent blood clotting
Found on http://www.encyclo.co.uk/local/20575

coumarins

<chemical> Synthetic or naturally occurring substances related to coumarin, the delta-lactone of coumarinic acid. Coumarin itself occurs in the tonka bean. The various coumarins have a wide range of proposed actions and uses including as anticoagulant, pharmaceutical aids, indicators and reagents, photoreactive substances, and antineoplastic ...
Found on http://www.mondofacto.com/facts/dictionary?coumarins
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