| http://www.w3.org/ns/prov#value | - wherein, R1 and R2 are independently or simultaneously straight or branched C1-10 alkyl or alkenyl group substituted or unsubstituted by C1-5 alkyl or alkenyl group, and preferably R1 and R2 are independently or simultaneously methyl, ethyl, propyl or vinyl group, and x is an integer from 0 to 4.
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