title: New estetrols in pregnancy urine.
mesh_terms: D002849:Chromatography, Gas; D004952:Esters / Q000032:analysis; D004964:Estriol / Q000031:analogs & derivatives* / Q000652:urine; D005260:Female; D006801:Humans; D006868:Hydrolysis; D006914:Hydroxysteroids / Q000652:urine; D013058:Mass Spectrometry; D008722:Methods; D008968:Molecular Conformation; D011247:Pregnancy; D012908:Snails
chemical_list: D004952:Esters; D006914:Hydroxysteroids; D004964:Estriol