| http://www.w3.org/ns/prov#value | - X2 and X3 is independently selected from the group consisting of RO???, RC(???O)O???, R2C???NO???, R2NO??? and R wherein each R is independently selected from the group consisting of hydrogen, alkyl, alkenyl, arenyl, aryl, and aralkyl groups, wherein each R, other than hydrogen, contains from 1 to 18 carbon atoms and, optionally, contains at least one oxygen or sulfur atom,
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