| http://www.w3.org/ns/prov#value | - l group with or without substituent, heterocyclic ring group with or without substituent, aryl group with or without substituent, and univalent group derived from the unsaturated chain hydrocarbon with or without substituent, or R12 and R13 represent a saturated or unsaturated ring in combination therewith, wherein the ring may be substituted or not substituted, R15 is a hydrogen atom, or alkyl gr
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