2,4,6-Triiodo-3-(2,6-diamino-4-hydroxypyridylazo)benzoic acid 3-(2,6-Diamino-4-hydroxy-3-pyridylazo)-2,4,6-triiodobenzoic acid 99970-78-2 BENZOIC ACID, 3-(2,6-DIAMINO-4-HYDROXY-3-PYRIDYLAZO)-2,4,6-TRIIODO- BRN 0501153