2-[2-({[2-(4-Bromo-phenyl)-2-oxo-ethyl carbamoyl]-methyl}-tert-butoxycarbonyl-amino)-acetylamino]-3-methyl-butyric acid methyl ester → 2-[2-({[2-(4-Bromo-phenyl)-2-oxo-ethylcarbamoyl]-methyl}-tert-butoxycarbonyl-amino)-acetylamino]-3-methyl-butyric acid

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2-[2-({[2-(4-Bromo-phenyl)-2-oxo-ethylcarbamoyl]-methyl}-tert-butoxycarbonyl-amino)-acetylamino]-3-methyl-butyric acid was prepared using method 801 substituting 2-[2-({[2-(4-bromo-phenyl)-2-oxo-ethylcarbamoyl]-methyl}-tert-butoxycarbonyl-amino)-acetylamino]-3-methyl-butyric acid methyl ester for 4-oxo-hexahydro-pyrrolo[1,2-a]pyrazine-2,6-dicarboxylic acid 6-ethyl ester 2-methyl ester. C22H30BrN3O7 calculated 527.1 observed [M+1]+ 528.1; rt=2.39 min.

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