LC–ESI‐MS/MS analysis for the quantification of morphine, codeine, morphine‐3‐β‐ D ‐glucuronide, morphine‐6‐β‐ D ‐glucuronide, and codeine‐6‐β‐ D ‐glucuronide in human urine J. Mass Spectrom. 2005; 40: 1412–1416
Constance M. Murphy, Marilyn A. Huestis
Abstract