| http://www.w3.org/ns/prov#value | - Substituents linking more than one 2-keto-1,4-diazacycloalkane (piperazinone) group are covalently bound to the piperazinone by additional steps, such as by condensation reactions or other reactions known to those skilled in the art, with appropriate precursor substituents, thus yielding polyfunctional hindered piperazinones as exemplified below.
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