[CH2:1]([NH:3][C:4]1[C:13]([CH3:14])=[CH:12][C:11]2[C:6](=[CH:7][CH:8]=[C:9]([N+:15]([O-])=O)[CH:10]=2)[N:5]=1)[CH3:2]>CO.[Pt]=O>[CH2:1]([NH:3][C:4]1[C:13]([CH3:14])=[CH:12][C:11]2[C:6](=[CH:7][CH:8]=[C:9]([NH2:15])[CH:10]=2)[N:5]=1)[CH3:2]The product (0.8 g) of Step B and platinum oxide on carbon (˜80 mg) was suspended in methanol. The resulting mixture was hydrogenated at 50 PSI for 1 h. The reaction mixture was filtered through filter aid and the solvent removed under vacuum to afford the product, which was used without further purification.
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