TfR-T12 is a transferrin receptor (TfR) binding peptide that can penetrate the blood-brain barrier (BBB), exhibiting a high binding affinity within the nanomolar (nM) range.
Hydroxy-PEG12-t-butyl ester is a PEG derivative containing a hydroxyl group and a t-butyl ester. The hydroxyl group enables further derivatization or replacement with other reactive functional groups. Under acidic conditions, the t-butyl protected carbox