<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A class of organic compounds containing a benzopyrone (a bicyclic structure of phenyl ring fused to a second-6 member ring that has five carbons, an oxygen atom at the 1 position, and a ketone attachment at the 2 position). Also refers to the simplest coumarin compound H-benzopyran-one (C9H6O2). the chemical structure is C1=CC=C2C(=C1)C=CC(=O)O2.</n0:def-definition><n0:def-source>CRCH</n0:def-source></n0:ComplexDefinition><n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A substance used to make drugs that prevent and treat blood clots in blood vessels and treat certain heart conditions. Coumarin is taken from certain plants and can also be made in the laboratory. It is a type of anticoagulant.</n0:def-definition><n0:def-source>NCI-GLOSS</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>O hydroxycinnamic acid. Pleasant smelling compound found in many plants and released on wilting. Has anticoagulant activity by competing with Vitamin K.</n0:def-definition><n0:def-source>NCI</n0:def-source><n0:attr>from On-line Medical Dictionary</n0:attr></n0:ComplexDefinition>