2-[3-[4-(4-Chlorophenyl)piperazin-1-yl]propyl][1,2,4]triazolo[4,3-a]pyridin-3(2H)-one; 4-Chloro Trazodone Isomer; 2-[3-[4-(4-Chlorophenyl)-1-piperazinyl]propyl]-1,2,4-triazolo[4,3-a]pyridin-3(2H)-one; 2-(3-(4-(4-chlorophenyl)piperazin-1-yl)propyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one; Trazodone EP Impurity C ; Trazodone Related Compound C ;