Linkers for Solid Phase Synthesis Products Purity (HPLC) CAS No. DHP Linker 99% min. [3749-36-8] HMBA Linker 98%min. [3006-96-0] HMPA Linker 99% min. [68858-21-9] Rink Amide Linker 98.5% min. [145069-56-3] Sieber Linker 99% min. Weinreb Linker 99% min.