[C:1]([O:5][C:6](=[O:19])[NH:7][C:8]1[CH:13]=[C:12]([Cl:14])[C:11]([CH3:15])=[CH:10][C:9]=1[N+:16]([O-])=O)([CH3:4])([CH3:3])[CH3:2].O.O.Cl[Sn]Cl>>[C:1]([O:5][C:6](=[O:19])[NH:7][C:8]1[CH:13]=[C:12]([Cl:14])[C:11]([CH3:15])=[CH:10][C:9]=1[NH2:16])([CH3:4])([CH3:2])[CH3:3](2-Amino-5-chloro-4-methyl-phenyl)-carbamic acid tert-butyl ester was prepared from (5-chloro-4-methyl-2-nitro-phenyl)-carbamic acid tert-butyl ester (Example A16) (11.9 g, 41.4 mmol) by reduction with SnCl2.2H2O according to the general procedure J (method b). Obtained as a yellow solid (9.25 g, 87%).
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