| http://www.w3.org/ns/prov#value | - l class of phosphate esters having a formula comprising either: wherein R is selected from the group consisting of an unsaturated hydrocarbon radical, wherein R is an alkylene radical, R is an alkyl radical or hydrogen, R is an alkyl radical or hydrogen, R is an alkyl radical or hydrogen, and R is a trivalent organic moiety, and R is selected from the group consisting of an alkyl radical and i RgO
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