| http://www.w3.org/ns/prov#value | - The metal complex salts of formula (X) are obtained by using a publicly known method for treatment of a monoazo compound obtained from a 2-aminophenol derivative represented by formula (iv), where X is a nitro group, sulfonamide group or halogen atom and Y is a hydrogen atom, halogen atom or nitro group (provided that X and Y are not both nitro groups) and a ??-naphthol, with a chromating or cobal
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