A derivative of a biologically active substituted tin compound with a lipophilic strong acid containing sulphur or phosphorus, such as an alkyl aryl sulphonate, an aryl sulphonate, a long chain, optionally substituted, alkyl sulphate, an alkyl-or aryl-phosphate, an ether sulphate, or olefin sulphonate, an ether phosphate, alkyl- or aryl-phosphonate or an alkyl- or aryl-sulphonsuccinate, or the corresponding acids of such lipophilic anions.
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