The invention relates to chromogenic compounds and the use thereof for the determination of enzymes of the family of carboxypeptidases N and carboxypeptidases U. The above is more specifically a compound of formula (I) in which A=(1), (2), (3), (4) or (5). R1. R2=H. —CH
3
, —CH(CH
3
)
2
, —OCH
3
, —Cl.—CF
3
,—OCF
3
,—SCH
3
, R
3
=an amino acid group which may be hydrolysed by a carboxypeptidase A and R
4
=a basic amino acid group.
该发明涉及变色化合物及其用于测定羧肽酶N和羧肽酶U家族酶的用途。具体而言,上述是一种具有
化学式(I)的化合物,其中A=(1)、(2)、(3)、(4)或(5)。R1、R2=H、—
CH3、—CH( )2、—O 、—Cl、—
CF3、—O 、—S ,R3=可能被
羧肽酶A水解的
氨基酸基团,R4=一种碱性
氨基酸基团。