title: The placental transfer of pentazocine and pethidine.
mesh_terms: D001769:Blood; D002849:Chromatography, Gas; D005260:Female; D006801:Humans; D008431:Maternal-Fetal Exchange; D008614:Meperidine / Q000097:blood*; D008722:Methods; D010423:Pentazocine / Q000097:blood*; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy; D013997:Time Factors; D014470:Umbilical Cord
chemical_list: D008614:Meperidine; D010423:Pentazocine