| http://www.w3.org/ns/prov#value | - n acyl group or a group as defined for R1 or R2 and R7 is a hydrogen atom or a group as defined for R1 or R3 ; where R1 and R2 represent a divalent grouping, this may for example be an alkylene or alkenylene group (preferably having up to 10 carbon atoms) which may carry one or more functional groups as defined above.
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