Patent number: 6809114
Abstract: This invention relates to benzopyran derivatives of the formula (I) wherein, R1 and R2 represent each independently a C1-6alkyl group, etc, R3 represents a hydroxyl group, etc, R4 represents a hydrogen atom, etc, R6 represents a hydrogen atom, R7 represents a hydrogen atom, etc, X is absent, or represents C═O, etc, R8 represents a hydrogen atom, a C1-6alkyl group, etc, R9 represents a hydrogen atom or a nitro group, when R9 represents a nitro group, Y represents a C4-8alkylene group, —(CH2)m—CR11R12—(CH2)n— or —(CH2)o—O—(CH2)p—, R5 represents a hydrogen atom, an amino group, a C1-6alkoxy group, a C1-6alkylthio group, a C1-6alkylamino group, a C1-6 alkoxycarbonylamino group, etc, or pharmaceutically acceptable salts thereof. These compounds are useful as an antiarrhythmic agent.
Type:
Grant
Filed:
July 14, 2003
Date of Patent:
October 26, 2004
Assignee:
Nissan Chemical Industries, Ltd.
Inventors:
Yoshio Ohara, Kazuhiko Ohrai, Kazufumi Yanagihara, Yukihiro Shigeta, Toru Tsukagoshi, Toru Yamashita