Synonyms: Sulfamicacid, dimethyl-, 3-[(5-cyano-1,6-dihydro-2-hydroxy-1,4-dimethyl-6-oxo-3-pyridinyl)azo]phenylester (9CI); Sulfamic acid, dimethyl-, 5-ester with1,2-dihydro-6-hydroxy-5-[(m-hydroxyphenyl)azo]-1,4-dimethyl-2-oxonicotinonitrile(8CI); Nicotinonitrile, 1,2-dihydro-6-hydroxy-5-[(m-hydroxyphenyl)azo]-1,4-dimethyl-2-oxo-,5-(dimethylsulfamate) (8CI)