5,8,11,14,17,20,23-Heptaoxa-2-azahexacosanedioic Acid 1-(1,1-Dimethylethyl) Ester is an analog of O-(2-Aminoethyl)-O’-[2-(Boc-amino)ethyl]hexaethylene Glycol (A608860) is a polyethyleneglycol (PEG) derivative used as a reagent in the preparation biotinylated spacers present in glucose-transporter probes.