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Med. Chem., 44, 3965 (2001) describes a process for preparing a 4-alkoxy-5-halogenoalkoxyanthranilic acid compound from a 4-alkoxy-5-halogenoalkoxy-2-nitrobenzoic acid compound. For example, methyl 5-(3-chloropropoxy)-4-methoxy-2-nitrobenzoate is reacted with a very excessive amount of iron and ammonium chloride in a mixture of water and methanol, to give methyl 2-amino-5-(3-chloropropoxy)-4-methoxybenzoate (i.e., methyl 5-(3-chloropropoxy)-4-methoxyanthranilate) in 93% yield.