title: Unsuccessful treatment of depression with tetrahydrobiopterin.
mesh_terms: D001708:Biopterins / Q000031:analogs & derivatives / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D003866:Depressive Disorder / Q000188:drug therapy*; D004311:Double-Blind Method; D004565:Electroconvulsive Therapy; D005260:Female; D006801:Humans; D011621:Pteridines / Q000627:therapeutic use*
chemical_list: D011621:Pteridines; D001708:Biopterins; C003402:sapropterin