英文名称:3-Pyridinecarbonitrile, 1-butyl-5-[(4-chloro-2-nitrophenyl)azo]-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-, mixture with 5-[(4-chloro-2-nitrophenyl)azo]-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-1-propyl-3-pyridinecarbonitrile; 3-Pyridinecarbonitrile, 1-butyl-5-[(4-chloro-2-nitrophenyl)azo]-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-, mixture with 5-[(4-chloro-2-nitrophenyl)azo]-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-1-propyl-3-pyridinecarbonitrile