prov:value
| - Examples of nucleophilic groups suitable as X or FnNU include, but are not limited to: ???NH2, ???NHR1, ???N(R1)2, ???SH, ???OH, ???COOH, ???C6H4???OH, ???H, ???PH2, ???PHR1, ???P(R1)2, ???NH???NH2, ???CO???NH???NH2, ???C5H4N, etc. wherein R1 is a hydrocrbyl group and each R1 may be the same or different.
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