title: Metabolism of tryptophan to nicotinic acid derivatives by women taking oesttrogen-progestogen preparations.
mesh_terms: D002624:Chemistry, Clinical; D003276:Contraceptives, Oral / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008656:Mestranol / Q000494:pharmacology*; D009536:Niacinamide / Q000652:urine*; D009641:Norethynodrel / Q000494:pharmacology*; D011728:Pyridones / Q000652:urine*; D011736:Pyridoxine / Q000378:metabolism; D013268:Stimulation, Chemical; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D003276:Contraceptives, Oral; D011728:Pyridones; D009536:Niacinamide; D009641:Norethynodrel; D014364:Tryptophan; D008656:Mestranol; D011736:Pyridoxine