CAS 2181-44-4 appears in our catalog under these names: Trimethylsulfonium methyl sulfate, TRIMETHYLSULFONIUM METHYL SULFATE, 98%, Trimethylsulfoniummethylsulfate, 98%,RG, 98%,RG. Offered by: Biosynth, Sigma-Aldrich, Chemat, Fluorochem. Available pack sizes: 25g, 1g, 5g, 100g.