咔唑

2,5-bis(4-bromoanilino)-3,6-dichlorocyclohexa-2,5-diene-1,4-dione

2,5-dichloro-3,6-bis(4-methylphenyl)cyclohexa-2,5-diene-1,4-dione

吩噻嗪

10-[2-(3,5,6-trichloro-1,4-benzoquinone)vinyl]phenothiazine