| http://www.w3.org/ns/prov#value | - alogen atom, a nitro group, a cyano group, a C1-C10 aliphatic radical, a C3-C10 cycloaliphatic radical, or a C2-C10 aromatic radical; ???b??? is an integer from and including 0 to and including 4; X and Y are selected from the group consisting of sulfur, selenium, oxygen, NH, and nitrogen substituted by a C1-C10 aliphatic radical, a C3-C10 cycloaliphatic radical, or a C2-C10 aromatic radical; and
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