prov:value
| - R1 and R2 are organic groups, which can be substituted or unsubstituted, such as straight or branched alkyl groups having from 1 to about 20 carbon atoms, including methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, and the like; aryl groups having from 1 to about 20 carbon atoms, straight or branched aralkyl or alkaryl groups having from 1 to about 20 carbon atoms; and the like.
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