| http://www.w3.org/ns/prov#value | - In formula I the optional substitution on X, which preferably is an optionally mono-unsaturated C2-3 chain, may for example take the form of halogen atoms or oxo, amino, carboxyl, hydroxy or alkyl groups or combinations or derivatives thereof such as for example amide, ester, ether or N-attached heterocyclic, e.g. 2,5-dioxo-pyrrolidino, groups.
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