| http://www.w3.org/ns/prov#value | - A method for the preparation of a transition metal complex of an aromatic o-hydroxymercaptan represented by the formula: ##STR10## wherein M is a transition metal and A represents a mono- or polynuclear aromatic ring system, which comprises reacting an aromatic ortho-hydroxythiocyanate with an essentially stoichiometric amount of a water-soluble transition metal salt in a water-miscible organic so
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