1-(3-O-sulfo-beta-D-galactosyl)-N-[(15Z)-tetracos-15-enoyl]sphingosine is an N-acyl-beta-D-galactosylsphingosine having a sulfo group at the 3-position on the galactose ring and (15Z)-tetracos-15-enoyl as the N-acyl group. It has a role as an epitope. It is a galactosylceramide sulfate and a N-acyl-beta-D-galactosylsphingosine. It is a conjugate acid of a 1-(3-O-sulfo-beta-D-galactosyl)-N-[(15Z)-tetracos-15-enoyl]sphingosine(1-).