| http://www.w3.org/ns/prov#value | - the formula I: ##STR8##In these equations, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and X have the above meanings, Me.sup..sym. is a metal cation or a substituted or unsubstituted ammonium ion and Y is halide, for example iodide, bromide or chloride, oralkylsulfate, for example methylsulfate.PREPARATION EXAMPLE0.05 part by weight of diphenyl sulfide is added to a solution of 8.9 parts by weight
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