CAS 55290-66-9 appears in our catalog under these names: 4-(3-Chlorophenyl)-1-(3-(3-oxo-2,3-dihydro-1,2,4-triazolo(4,3-a)pyridin-2-yl)propyl)piperazine N1-Oxide Hydrochloride (Trazodone N-Oxide Hydrochloride), Trazodone Impurity A. Offered by: Mikromol, Biosynth. Available pack sizes: 25mg, 100mg.