Patent ID: 7307074

Claim:
A diazepan compound represented by the following formula (I) or a salt thereof: symbols in the above formula have the following meanings: rings A and B: they are the same or different and are each aryl or heteroaryl which may have 1 to 3 substituents; X 1 : —C(═O)—NR 4 —, —NR 4 —C(═O)—, —NR 4 —CH 2 —, —O—CH 2 —, —CH 2 —CH 2 — or —CH═CH—; X 2 : —C(═O)—NR 5 — or —NR 5 —C(═O)—; R 1 : hydrogen atom, lower alkyl, -lower alkylene-O— lower alkyl, C 3-8 cycloalkyl, aryl, heteroaryl, -lower alkylene-C 3-8 cycloalkyl, -lower alkylene-aryl, -lower alkylene-heteroaryl or —C(═NR 6 )-lower alkyl; R 2 : —OH; R 3 : hydrogen atom, halogen atom or lower alkyl; and R 4 , R 5 and R 6 : they are the same or different and are each hydrogen atom or lower alkyl.