| http://www.w3.org/ns/prov#value | - r aryl group, or a pair of R317 and R318 and a pair of R319 and R320 taken together, may form a benzene, naphthalene or pyridine ring; R321 is a hydrogen atom, a straight, branched or cyclic C1-C10 alkyl group or aryl group; R322 and R323 each are a hydrogen atom, a straight, branched or cyclic C1-C10 alkyl group or aryl group, or a pair of R321 and R323, taken together, may form a benzene or naph
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