| http://www.w3.org/ns/prov#value | - R14, which may be same or different in each of the groups R1, R2, R3, and R4, is an alkyl group, straight chain or branched, saturated or unsaturated, substituted or unsubstituted, containing 1 to 6 carbon atoms, preferably, ???R14???is the group ???(CHp)n???, in which p is 0, 1, or 2, and n varies from 1 to 6;
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