prov:value
| - A colorant compound according to claim 1 wherein at least one of A, E, and G is a substituent selected from the group consisting of a hydroxy group, a halogen atom, an amine group, an imine group, an ammonium group, a cyano group, a pyridine group, a pyridinium group, an ether group, an aldehyde group, a ketone group, an ester group, an amide group, a carbonyl group, a thiocarbonyl group, a sulfat
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