| 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 direct bond linking Xr with R1, R2, or R3 ; and
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