CAS 134892-19-6 appears in our catalog under these names: 2-(t-Butoxycarbonyl)ethylboronic acid, pinacol ester, 98%, tert-Butyl 3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)propionate 98%, Tert-butyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propanoate, 99.71%, Tert-butyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propanoate, 98%, 98%, Tert-butyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propanoate, 98%. Offered by: Combi-blocks, Ambeed, MedChemExpress, Chemat, Fluorochem. Available pack sizes: 25g, 5g, 1g, 10 g, 100 mg, 250 mg, 1 g, 25 g.