Boc-1-amino-3,6-dioxa-8-octanediamine153086-78-330 % similar (3S)-3-(((tert-Butoxy)carbonyl)amino)butanoic acid158851-30-030 % similar 5-(1,1-Dimethylethyl) hydrogen L-glutamate2419-56-930 % similar N-(tert-Butoxycarbonyl)glycylglycine31972-52-830 % similar H-D-Glu(otbu)-oh45125-00-630 % similar Boc-NH-PEG4-amine811442-84-930 % similar