Patent ID: 7626018

Claim:
A chromogenic enzymatic substrate, according to formula (I) below: wherein: R1 represents a hydrogen atom, a C1-C12 alkyl group, a C6-C14 aralkyl group, an aryl group, —COOH, —COOR′ or —NR″R′″, R2 represents a hydrogen atom, a halogen atom, a C1-C12 alkyl group, —COOH or —COOR′, R3 represents a hydrogen atom, a halogen atom, a C1-C12 alkyl group, —CN, —CONH2, —COOR′ or —COR′, R4, R5 and R6 each independently represent a hydrogen atom, a halogen atom, —COOR′ or a C1-C3 alkyl group, at least one of R4, R5 and R6 is a hydrogen atom, R′ represents a hydrogen atom or a C1-C6 alkyl group, R″ and R′″ each independently represent a C1-C6 alkyl group, or R″ and R′″, together with the nitrogen atom to which they are attached, form a heterocyclic ring containing one or more heteroatoms, A represents at least one amino acid, and X represents a blocking agent or nothing.