| http://www.w3.org/ns/prov#value | - Here, any two groups among R1 to R4 and Z may form a 5 to 7 member ring by mutual bonding.) [0046] In general formula (1), methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, t-butyl group, n-octyl group, benzyl group, and hexadecyl group may be cited as examples of an alkyl group expressed by X; aryl group and oleyl group may be cited as examples of an alkenyl group; ethyny
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