1-(ethylthio)-4-((4-nitrophenyl)diazenyl)isoquinolin-3-ol

1-Ethylsulfanyl-4-(4-methoxy-phenylazo)-isoquinolin-3-ol

1-(ethylthio)-4-(m-tolyldiazenyl)isoquinolin-3-ol

1-Ethylsulfanyl-4-p-tolylazo-isoquinolin-3-ol

4-(4-Chloro-phenylazo)-1-ethylsulfanyl-isoquinolin-3-ol