CAS 108311-21-3 appears in our catalog under these names: D-Fructose-13C1, D-FRUCTOSE-1-13C, 99 ATOM % 13C, D-Fructose-13C, ≥99 atom% 13C,≥99%, ≥99 atom% 13C,≥99%, D-Fructose-13C, 99.95%. Offered by: Biosynth, Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 500mg, 250mg, 1000mg, 2000mg, 10mg, 50mg, 50 mg, 100 mg.