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Dodecaethylene glycol octadecyl ether thiol (C18-PEG12-SH) is an amphiphilic diblock copolymer. It is usually a solid powder or particle, because the sulfhydryl group is sensitive to water and air, so it is often filled with inert gas, tighten the cap, and timely put into the refrigerator frozen layer for preservation. https://peg.bocsci.com/catcs/746/c18-peg12-sh/