<unk>  is a phenylpiperazine compound and a major metabolite of the antidepressant nefazodone. It has similar biological activity and a similar elimination half-life (1.5 to 4 hours) to those of nefazodone, and may contribute significantly to its effects.
Hydroxynefazodone
Naltrexone
Normethadone
Methadone
Nefazodone
Norhydrocodone
Isomethadone
Hydrocodone