| http://www.w3.org/ns/prov#value | - e salt, hydroxy, nitro, amino or cyano groups; R6 is aryl, aryloxy, alkyl or alkoxy; and M is H+ or other metal or non-metal cation, with the proviso that at least one of M is H+ or is a moiety which can be thermally transformed into a proton under process conditions. 21.
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