Triazoledione
Triazoledione is a phenylpiperazine compound and a major metabolite of the antidepressant nefazodone. It is active, but with substantially reduced potency compared to nefazodone. As such, it has been suggested that it is unlikely that triazoledione contributes significantly to the pharmacology of nefazodone. However, triazoledione may reach concentrations as great as 10 times those of nefazodone, and hence could still be a significant contributor to its therapeutic effects.