Patent ID: 7968508

Claim:
A washing or cleaning agent, comprising a protease and a stabilizing compound of the structural formula in which (a) X stands for a carbonyl group (C═O) or an acid amide group (NHCO), (b) R1, R2, R3, R4 and R5 (in ring 1) stand for hydrogen (H), a carboxyl group (COOH), a methyl group (CH 3 ), an ethyl group (C 2 H 5 ), a hydroxyl group (OH), a hydroxymethyl group (CH 2 OH), an amino group (NH 2 ) and/or a halogen, such that at least one carboxyl group (COOH) is present in ring 1; (c) R6, R7, R8, R9 and R10 (in ring 2) stand for hydrogen (H), a carboxyl group (COOH), a methyl group (CH 3 ), an ethyl group (C 2 H 5 ), a hydroxyl group (OH), a hydroxymethyl group (CH 2 OH), an amino group (NH 2 ) and/or a halogen, such that at least one carboxyl group (COOH) is present in ring 2; and (d) optionally two of the radicals R1 to R10 (A) and (B) are in ortho position to one another, (A) being an obligatory carboxyl group (COOH) mentioned in (b) and/or (c) or optionally an additional carboxyl group, and (B) being a hydroxymethyl group, which are present as such groups or optionally as the group CH 2 —O—CO— and thus together with the carbon atoms of the ring having them denote a five-membered lactone.