prov:value
| - y of the others, are hydrogen atoms or alkyl groups, and X is an anion; (c) those of the general formula ##STR13## 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 ##STR14## wherein R1 is an alkyl group, R2 and R3 each, independently of the other, are hydrogen atoms or alkyl groups, and
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