CAS 108311-21-3 appears in our catalog under these names: D-Fructose-13C1, D-Fructose-13C, 99.95%, D-Fructose-13C, ≥99 atom% 13C,≥99%, D-Fructose-1-13C 13C 99atom %. Offered by: Biosynth, MedChemExpress, Chemat, Sigma-Aldrich. Available pack sizes: 500mg, 250mg, 1000mg, 2000mg, 50 mg, 100 mg, 10 mg, 25 mg.