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Sharma, A., Ramos-Tomillero, I., El-Faham, A., Nicolas, E., Rodriguez, H., de la?Torre, B. G., & Albericio, F. (2017). Understanding Tetrahydropyranyl as a Protecting Group in Peptide Chemistry. ChemistryOpen, 6(2), 168–177. doi:10.1002/open.201600156 
10.1002/open.201600156