(3-Hydroxy-4-(phenylazo)phenyl)trimethylammonium iodide dimethylcarbamate (ester) 66967-86-0 AMMONIUM, (3-HYDROXY-4-(PHENYLAZO)PHENYL)TRIMETHYL-, IODIDE, DIMETHYLCARBAMATE ( Ammonium, (3-hydroxy-4-(phenylazo)phenyl)trimethyl-, iodide, dimethylcarbamate (ester) Ro 2-1940