the 'metabolic ratios ' ( mr ) in urine of codeine o-demethylation ( codeine/ ( morphine ( m ) + morphine-3- and 6-glucuronides ( m3g and m6g ) + normorphine ] , n-demethylation ( codeine/ ( norcodeine ( nc ) + norcodeine glucuronide + normorphine ( nm ] ) and glucuronidation ( codeine/codeine-6-glucuronide ( c6g ] were calculated following h.p.l.c . analysis of urine samples collected over 8 h .
C0026549
morphine
C0009214
codeine