CAS 2304-81-6 appears in our catalog under these names: C18 Ceramide, >95% (HPLC), N-Stearoylsphingosine/ 99.89% (existing batch purity), C18 Ceramide (d18:1/18:0), C18-Ceramide 97%, N-STEAROYL-D-SPHINGOSINE. Offered by: TRC, TargetMol, GLPBio, Ambeed, Sigma-Aldrich. Available pack sizes: 10mg, 50mg, 5mg, 1mg, 25mg, 100mg, 250mg, 1g.