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Meta- and para-azidobenzamidine have been prepared and evaluated as photoaffinity labels. The compounds inhibit trypsin reversible in the dark and are competitive with substrate binding. Upon photolysis, irreversible noncompetitive inhibition is observed and is dependent upon concentration, photolysis time, and pH. Specificity of the probes is indicated by experiments in which p-tosyl-l-arginine methyl ester, a trypsin substrate, is used to protect against photoinactivation. Maximumpmid:632242 fatcat:flt2v2aksvaozor4vvxkgor4j4