2-(4-bromo-phenylazo)-3-[2]furyl-3-oxo-propionic acid thianthren-2-ylamide
3-[2]furyl-3-oxo-2-phenylazo-propionic acid thianthren-2-ylamide
2-(4-chloro-phenylazo)-3-[2]furyl-3-oxo-propionic acid thianthren-2-ylamide
3-[2]furyl-3-oxo-2-p-tolylazo-propionic acid thianthren-2-ylamide
3-[2]furyl-2-(4-methoxy-phenylazo)-3-oxo-propionic acid thianthren-2-ylamide