6-Bromoindirubin-3′-oxime667463-62-9100 % similar Indirubin479-41-450 % similar Isatin β-oxime607-28-341 % similar Methyl (3E)-2,3-dihydro-3-(methoxyphenylmethylene)-2-oxo-1H-indole-6-carboxylate1168150-46-632 % similar Indigo blue482-89-330 % similar