| http://www.w3.org/ns/prov#value | - wherein R??? is lower alkene C1 to C6 wherein n is an integer equal to or greater than 1, X is a hetero atom such as ???O???, ???S???, or a bridging group such as ???NH???, ???S(???O)???, ???SO2???, ???C(???O)???, ???C(CH3)2???, ???CH(CH3)???, ???CH(CH3)???CH2???CH(CH3)???,
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