N-Oleoyl-D-erythro-sphingosine is a member of the ceramide family, acting as a signaling molecule with its proapoptotic function among the most studied. N-Oleoyl-D-erythro-sphingosine is a member of the ceramide family, acting as a signaling molecule with its proapoptotic function among the most studied. General description： C18:1 Ceramide (d18:1/18:1(9Z)) or N-oleoyl-D-erythro-sphingosine is a synthetic ceramide containing sphingosine with oleic acid. application： C18:1 Ceramide (d18:1/18:1(9Z)) may be used as a standard: to quantify ceramide content in muscle tissue samples using high-performance liquid chromatography/tandem mass spectrometry (HPLC/MS2) for the absolute quantification of epidermal lipids using liquid chromatography-tandem mass spectrometry (LC/MS/MS) for the ratiometric quantification of sphingomyelin (SM)