| http://www.w3.org/ns/prov#value | - others, are hydrogen atoms or alkyl groups, and X is an anion; (c) those of the general formula ##STR20## wherein R1 is an alkyl group, R2 and R3 each, independently of the other, are hydrogen atoms or alkyl groups, and X is an anion; (d) those of the general formula ##STR21## wherein R1 is an alkyl group, R2 and R3 each, independently of the other, are hydrogen atoms or alkyl groups, and X is an
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