<prompt> The following metabolite is a derivative of tryptophan-MelatoninThyroxineEpinephrineNor epinephrine  <response>: Ans. is a i.e., Melatonin Amino acidsBiological important compoundTyrosineCatecholamines epinephrineQ, norepinephrineQ, dopamineQ, thyroxineQ, triiodothryonine, melanin Q.Note: - Phenylalanine is the precursor of tyrosine, thus it can also give rise to all these compounds through tyrosine phenylalanine - TyrosineQ - CatecholaminesQ, thyroxineQ, T3, melaninQ.TryptophanVitamin niacinQ, melatoninQ, SerotoninQGlycineQ,ArginineQ,methionineQCreatineQGlycine, cysteineBile saltsGlycineHeme.Aspartic acid andglutaminePyrimidine basesGlycineQ,aspartic acid,glutaminePurine basesQb-alanineCoenzyme-AArginineNitric oxideQGlutamateGama-amino butyric acid GABA 