prov:value
| - esent the radical of a benzene, naphthalene, pyrazole or acetoacetylarylamide coupling component, bearing Y and Y respectively, in orthoposition to the N=N bridge, X and X each represent -O, COO- or NSO --R wherein R is an alkyl or aryl radical, Y and Y each represent preferably O, or they represent NR wherein R is hydrogen or an alkyl or aryl radical, Me represents chromium or cobalt, and M repre
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