| http://www.w3.org/ns/prov#value | - where r is an integer at least 1, each X is independently C or O, and each C can independently be substituted or unsubstituted saturated or unsaturated, and Y4 is selected from the group consisting of O, S, NH, N???N and a direct bond linking Xr with R1, R2, or R3, although other atoms, or groups of atoms, could also serve in this capacity.
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