| http://www.w3.org/ns/prov#value | - red together with the atoms linking them, form a tetrahydropyridine ring, or onto a coupling component of the formula ##STR36## the amine of the formula (36) and the coupling components of the formulae (37) and (38) being unsubstituted or substituted by C1 -C4 alkyl, C1 -C4 alkoxy, C2 -C4 alkanoylamino, halogen, sulfo or a radical of the formula --X--SO2 CH2 CH2 OSO3 H, in which X is a direct bond
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