tert-Butyl 6-(7-chloro-3-(2-chlorophenethyl)-1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-benzo[e][1,4]diazepin-5-yl)-2-oxo-2,3-dihydro-1H-imidazo[4,5-b]pyridine-1-carboxylate → 7-Chloro-3-(2-chlorophenethyl)-1-(4-methoxybenzyl)-5-(2-oxo-2,3-dihydro-1H-imidazo[4,5-b]pyridin-6-yl)-1H-benzo[e][1,4]diazepin-2(3H)-one

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tert-Butyl 6-(7-chloro-3-(2-chlorophenethyl)-1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-benzo[e][1,4]diazepin-5-yl)-2-oxo-2,3-dihydro-1H-imidazo[4,5-b]pyridine-1-carboxylate (90 mg) was dissolved in 4 N HCl in dioxane (10 mL), and stirred at room temperature for 2 h, then concentrated delivering pure product (50 mg, 75% yield). MS (ES+) m/z 607.9 (M+Na).

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