| http://www.w3.org/ns/prov#value | - yl group in which the alkyl group preferably has 1 to 5 carbon atoms, or a lower (generally from 1 to 6, especially 1 to 4, carbon atoms) amidoalkyl group, or R and R' denote, together with the nitrogen atom to which they are attached, a heterocyclic group such as piperidinyl or morpholinyl, and Y.sup.??? is an anion, such as bromide, chloride, acetate, borate, citrate, tartrate, bisulphate, bisul
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