| http://www.w3.org/ns/prov#value | - When needed, functional groups can be added to various substances through derivatization or substitution reactions. [0099] Examples of functional groups are aldehydes, allyls, amines, amides, azides, carboxyls, carbonyls, epoxys (oxiranes), ethynyls, hydroxyls, ketones, certain metals, nitrenes, phosphates, propargyls, sulfhydryls, sulfonyls, phenolic hydroxyls, indoles, bromines, chlorines, iodin
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