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