D-erythro-Sphingosine-13C2,d2 is a deuterated labeled D-erythro-Sphingosine[1]. D-erythro-Sphingosine (Erythrosphingosine) is a very potent activator of p32-kinase with an EC50 of 8 µM, and inhibits protein kinase C (PKC). D-erythro-Sphingosine (Erythrosphingosine) is also a PP2A activator[2][3][4][5].