SEARCH Articles Figures Tables 2- Carboxy-3,6-dihydroxy-4- 2-Anilino-2,5-dihydroxy 3- Anilino-5- 4- Anilino-2-carboxy-4 -chlor-3,6-dihydroxy 4-Anilino-2-carboxy-3,6-dihydroxy-4 -methyl