5-(3-chloro-phenylimino)-9-dimethylamino-5H-benzo[a]phenoxazin-2-ol
9-dimethylamino-5-(4-methoxy-phenylimino)-5H-benzo[a]phenoxazin-2-ol
9-dimethylamino-5-(4-hydroxy-phenylimino)-5H-benzo[a]phenoxazin-2-ol
4-(9-dimethylamino-2-hydroxy-benzo[a]phenoxazin-5-ylideneamino)-benzaldehyde
2,3-dihydroxy-valeric acid