Diadenosine hexaphosphate hydrolase (ATP-forming) (, Ndx1) is an enzyme with systematic name P1,P6-bis(5'-adenosyl)hexaphosphate nucleotidohydrolase (ATP-forming). This enzyme catalyses the following chemical reaction
The enzyme requires the presence of the divalent cations (Mn<sup>2+</sup>, Mg<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup>).