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Hydroxy-PEG10-t-butyl ester is a PEG linker containing a hydroxyl group with a t-butyl ester. The hydrophilic PEG spacer increases solubility in aqueous media. The hydroxyl group enables further derivatization or replacement with other reactive functional groups. The t-butyl protected carboxyl group can be deprotected under acidic conditions.

Hydroxy-PEG10-Boc is extacted from patent CN108707228 (example 0024)[1]. Hydroxy-PEG10-Boc is a uncleavable ADC linker used in the synthesis of antibody-drug conjugates (ADCs). Hydroxy-PEG10-Boc can be conjugated to Paclitaxel (HY-B0015) or docetaxel (HY-B0011)[2].

[1] Huli, et al. A kind of preparation method of hydroxyl polyethylene glycol propionic ester. Patent CN108707228A.
[2] Miller ML, et al. Synthesis of taxoids with improved cytotoxicity and solubility for use in tumor-specific delivery.J Med Chem. 2004 Sep 23;47(20):4802-5. DOI:10.1021/jm049705s