| http://www.w3.org/ns/prov#value | - In the above formula, preferably, R1 is a lower alkyl group (for example, C1-6 alkyl group such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, s-butyl, t-butyl, pentyl, hexyl etc.), R2 is a lower alkyl group (for example, C1-6 alkyl group such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, s-butyl, t-butyl, pentyl, hexyl etc.) optionally substituted with an optionally substituted cyc
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