Bis-(N,N'-carboxyl-PEG4)-Cy5 is a polyethylene glycol (PEG)-based linker compound employed in the synthesis of proteolysis targeting chimeras (PROTACs)[1].
(S)-6-methoxychroman-3-carboxylic acid is a synthetic compound with a molecular formula of C11H10O5. It is a member of the chroman family of compounds, which are characterized by a seven-membered ring with one oxygen and one carbon atom.