Contact us for more details of our high quality 1,2-dihydro-6-hydroxy-1,4-dimethyl-2-oxo-5-[[3-[(phenylsulphonyl)oxy]phenyl]azo]nicotinonitrile（CAS:59312-61-7）. Amitychem Corporation will be your strong partner in China with our 15 years experience specialized in the the field, our ISO/SGS/CQC certificated quality, our seriously & timely response service.