| http://www.w3.org/ns/prov#value | - preferred that at least one of R.sup.3 and R.sup.4 is hydrogen, i.e., that the amine is a primary amine or a secondary amine rather than a tertiary amine. R.sup.5 and, when not hydrogen, R.sup.3 can for example be hydrocarbyl groups especially alkyl,
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