[N+:1]([C:4]1[CH:5]=[C:6]([N:10]2[C:14](=[O:15])[CH2:13][NH:12][C:11]2=[O:16])[CH:7]=[CH:8][CH:9]=1)([O-])=O>[Pd].CO>[NH2:1][C:4]1[CH:5]=[C:6]([N:10]2[C:14](=[O:15])[CH2:13][NH:12][C:11]2=[O:16])[CH:7]=[CH:8][CH:9]=1A solution of 3-(3-nitrophenyl)-2,4-imidazolidinedione (4.4 g, 20 mmol) and methanol (100 mL) was treated with 10% Pd/C (1.0 g) and placed under H2 (40 psi) for 2 h. The mixture was then filtered through celite and concentrated to afford the title compound (3.8 g).
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