1: maleic anhydride; 4-amino-phenol With sulfuric acid; phosphorus pentoxide in DMF (N,N-dimethyl-formamide); water T=0 - 70°C; 3.5 h; 2: 1H-pyrrolidine-1-(4'-hydroxy-phenyl)-2,5-dione; aniline With formaldehyd in dichloromethane T=110°C; 0.333333 h;