| http://www.w3.org/ns/prov#value | - In the preceding structural formulas, each R1 can be the same or different and is an optionally substituted group selected from hydrogen, aliphatic (e.g., alkyl, alkenyl, alkynyl), alkoxy, cycloaliphatic (e.g., cycloalkyl, cycloalkenyl, and cycloalkynyl), aryl, heteroaryl, heterocyclyl, cycloaliphaticalkyl, aralkyl, heteroaralkyl, heterocyclylalkyl, and the like.
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