D-erythro-Sphingosine-13C2,d2 is a deuterated labeled D-erythro-Sphingosine. D-erythro-Sphingosine (Erythrosphingosine) is a very potent activator of p32-kinase with an EC 50 of 8 μM, and inhibits protein kinase C ( PKC ). D-erythro-Sphingosine (Erythrosphingosine) is also a PP2A activator.