prov:value
| - In the above formula (I), R1 is a hydrogen atom or a hydrocarbon group which may be chain-like or cyclic hydrocarbon groups including C1-6 alkyl groups (e.g. methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl and hexyl), C2-6 alkenyl groups (e.g. vinyl, allyl, isopropenyl, butenyl, isobutenyl and sec-butenyl), C2-6 alkynyl groups (e.g.propargyl, ethynyl, butynyl and 1-hexynyl),
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