Ammonium Chloride → ethyl 6-[[3-amino-5-methyl-4-[3-[5-[N-[(2-methylpropan-2-yl)oxycarbonyl]carbamimidoyl]-2-methylsulfanylthiophen-3-yl]sulfonylphenyl]phenyl]carbamoylamino]hexanoate

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6-(3-{3′-[5-(tert-Butoxycarbonylamino-imino-methyl)-2-methylsulfanyl-thiophene-3-sulfonyl]-6-methyl-2-nitro-biphenyl-4-yl}-ureido)-hexanoic acid ethyl ester (74 mg, 98.9 μmol, Example 278: step b) in EtOH (5 mL) was reduced as in Example 20: step c using Fe (28 mg, 0.50 mmol) and aqueous NH4Cl solution (50 mg, 0.93 mmol, 10 mL). The solvents were removed from the filtrate in vacuo. The crude was diluted in EtOAc and washed with water and brine. The organic layer was dried over magnesium sulfate. The solvents were removed in vacuo to yield the title compound as a brown oil (70.8 mg, quantitative). ESI-MS (m/z): Calcd. for C33H43N5O7S3: 718.2 (M+1); found: 718.1.

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