| http://www.w3.org/ns/prov#value | - a carboxy group; R2 is a pyridyl group; and R3 is a C6-10 aryl group optionally having 1 to 3 substituents selected from halogen atom, C1-3 alkylenedioxy, optionally halogenated C1-6 alkyl, carboxy C2-6 alkenyl, optionally halogenated C1-8 alkoxy, hydroxy, C7-16 aralkyloxy and C1-6 alkyl-carbonyloxy (two adjacent alkyl groups as substituents may be bonded to form a 5 membered non-aromatic carbon
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