| http://www.w3.org/ns/prov#value | - 3) a diphosphate ester having the formula: wherein R1 and R4 can be hydrogen atoms or C1-C20 radicals, and R2 and R3 are the same C1-C20 radical or a combination of different C1-C20 radicals; and (4) a phosphonate ester having the formula: wherein R1 is a hydrogen atom or a C1-C20 radical, and R2 and R3 are the same C1-C20 radical or a combination of different C1-C20 radicals. 2.
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