| http://www.w3.org/ns/prov#value | - where R1-R7 are each independently selected from hydrogen and C1-4; Z is a carbon-carbon single bond or carbon-carbon double bond; q is 0 or 1; and p is an integer between 1 and 5, examples of which are 3-carboxyacryloyl phenylhydrazine, methyl-3-carboxyacryloyl phenylhydrazine, 3-carboxypropanoyl phenylhydrazine, and methylene-3-carboxypropanoyl phenylhydrazine.
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