this procedure , compared with the gas-chromatographic procedure of kupferberg [ clin . chim . acta 29 , 283 ( 1970 ) ] , gave a weighted regression line -- forced through the origin -- of y= ( 1.01+/-0.04 ) x for phenobarbital , y= ( 0.95+/-0.04 ) x for primidone .
C0031412
phenobarbital
C0033148
primidone