First, dFdCDP inhibits ribonucleotide reductase, which is uniquely responsible for catalysing the reactions that produce deoxynucleoside triphosphates (dCTP) for DNA synthesis.
Esmalt inhibeerib dFdCDP ribonukleotiidide reduktaasi, mis katalüüsib reaktsioone, mille tagajärjel tekivad DNA sünteesi desoksünukleosiidi trifosfaadid (dCDP).