| http://www.w3.org/ns/prov#value | - ich may be the same or different, is --CH???CH2 or --CH2 --CH???CH2, each of R6 and R7 which may be the same or different, is a hydrogen atom, --CH3, --(CH2)g --OH wherein g is an integer of from 1 to 5, --(CH2 CH2 O--)h --R8 wherein R8 is a hydrogen atom or --CH3, and h is an integer of from 0 to 12, or --COOR9 wherein R9 is a hydrogen atom or --CH3, c is an integer of from 0 to 3, d is an intege
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