Molecular Formula: C9H7N CAS NO. 91-22-5 EINECS 202-051-6 It can also be used in acid, solvent, preservative, etc. In the pharmaceutical industry, it is used to produce niacin and 8-hydroxyquinoline drugs. Used for making cyanine blue pigment and photosensitive pigment in printing and dyeing industry; Rubber industry for the production of promoters; In agriculture, it is used to produce 8-hydroxyquinolinone and other pesticides