M7GpppX diphosphatase (, DcpS, m7GpppX pyrophosphatase, m7GpppN m7GMP phosphohydrolase) is an enzyme with systematic name m<sup>7</sup>G<sup>5</sup>'ppp5'N m<sup>7</sup>GMP phosphohydrolase. This enzyme catalyses the following chemical reaction
Decapping is a process in the control of eukaryotic mRNA degradation.