the antidepressant drug amitriptyline and two of its metabolites , nortriptyline and desmethylnortriptyline , each containing two 13c atoms , have been used to determine the sensitivity and selectivity of 13c-nmr spectroscopy for the detection of unchanged amitriptyline and n-desmethyl metabolites in the urine of animals dosed orally with the labelled drug .
C0028420
nortriptyline
C0002600
amitriptyline