| http://www.w3.org/ns/prov#value | - They have the formula 1 where n is an integer of at least 1, R and R, which may be the same or different, are saturated or unsaturated straight chain or branched alkyl groups having 6 to 24 carbon atoms, preferably 10 to 20 carbon atoms, and more preferably 14 to 16 carbon atoms; and R' is a saturated or unsaturated straight chain or branched alkyl gro
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