acetanilide with the three hydrogens of the acetyl group replaced by deuterium was administered to 9 human volunteers ( 50 mg p.o . ) and 5 male sprague-dawley rats ( 10 mg kg-1 p.o . and 100 mg kg-1 p.o . ) and urine samples collected for 8 and 48 h , respectively .
C0020275
hydrogens
C0011744
deuterium