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Derivatives of dipeptide and their use in determining the activity of carboxypeptidase A

Image Number 2 for United States Patent #4551272.

Derivatives of dipeptide having the following general formula and their use as substrates for colorimetrically or spectrophotometrically measuring the activity of carboxypeptidase A: ##STR1## wherein X is OH in ortho or para position, or NH.sub.2 or CH.sub.3 O in para position, Y is ##STR2##

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