Carbobenzoxy-L-isoglutamine

The action of crystalline papain on synthetic substrates was first studied by Balls and Lineweaver (9), who observed that hippuryl-amide and carbobenzoxy-L-isoglutamine were hydrolyzed. 

Fig. 15. Effect of pH on the hydrolysiB of four substrates by crystalline papain in the presence of 0.005 M cysteine and 0.001 M Versene (100). The substrates were carbobenzoxy-L-leucinamide (CLA), hippurylamide (HA), carbobenzoxy-i/-glutamic acid diamide (CGDA), and carbobenzoxy-L-isoglutamine (CIG).

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