2-hydroxy-7,7'-dimethyl-1-nitroso-1,2,1',2'-tetrahydro-[2,2']biindolyl-3,3'-dione

乙醇

7,7'-dimethyl-1H,1'H-[2,2']biindolylidene-3,3'-dione

醋酸

醋酸铬