A chemical moiety used to protect a reactive functional group during a chemical reaction, and is removed at the end of the reaction.
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triethylammonium 2-(2,2-dimethyl-3-(trityloxy)propanoylthio)ethyl phosphonate
(3beta,5beta,8xi,9xi)-3-(beta-D-glycero-hexopyranosyloxy)-5,14,19-trihydroxycard-20(22)-enolide