<prompt> The following metabolite is a derivative of tryptophanMelatoninThyroxineEpinephrineNor epinephrine  <response>: Tryptophan is conveed to Seratonin, which is then acetylated and fuher methylated to form Metatonin.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 240, Fig no 18.10. 