| http://www.w3.org/ns/prov#value | - It is furthermore possible to convert a radical R3 and/or R4 in a compound of the formula I into another radical R3 and/or R4, for example by reducing nitro groups (for example by hydrogenation of a Raney nickel or Pd-carbon in an inert solvent, such as methanol or ethanol) to amino groups or hydrolysing cyano groups to COOH groups.
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