I have an O-acetyl protected sugar which is acyl linked to the carboxylic acid end of a fatty acid. Deprotection has thus far been impossible without destroying the linkage. Strong acid or base will also destroy the linkage and cannot be used. Thus far, the enzymatic approach using Lipase Amano AS has failed and DIPEA has not worked either. I've run out of ideas and any deprotection strategies / suggestions are appreciated. TIA,