title: II. Distribution and metabolism of morphine and its surrogates.
mesh_terms: D000478:Alkylation; D000700:Analgesics / Q000378:metabolism*; D001711:Biotransformation; D004361:Drug Tolerance; D008745:Methylation; D009020:Morphine / Q000378:metabolism*
chemical_list: D000700:Analgesics; D009020:Morphine