CAS 403501-30-4 appears in our catalog under these names: SHI EPOXIDATION OXAZOLIDINONE METHYL CA&, (3A'R,5S,7a'R)-2',2'-dimethyl-3-(p-tolyl)dihydrospiro[oxazolidine-5,6'-[1,3]dioxolo[4,5-c]pyran]-2,7'(4'H)-dione, 95%, 95%. Offered by: Sigma-Aldrich, Chemat. Available pack sizes: 100MG, 500MG.