for the following products
2-(2-(2-(2-(t-Butyloxycarbonylamino)ethoxy)ethoxy)ethoxy)ethanol | BocNH-PEG4-OH | N-Boc-Aminoehtoxy-ethoxy-ethoxy-ethanol | tert-Butyl N-(2-{2-[2-(2-hydroxyethoxy)ethoxy]ethoxy}ethyl)carbamate and 1-Boc-amino-3,6,9-trioxaundecanyl-11-ol
