the metabolism of 2- [ 14c ] -folic acid , 2- [ 14c ] -5-methyltetrahydrofolate 5- [ 14c ] -methyltetrahydrofolate , and a mixture of 2- [ 14c ] -folic acid and 3',5',7,9- [ 3h ] -folic acid has been studied in rats that were dosed with methotrexate ( mtx ) 24 h before receiving the radioactive folate .
C0016410
folic acid
C0025677
methotrexate