5-(tert-butoxy)-5-oxo-4-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)pentanoic Acid has been used in synthesis of; GdDOTAGA(C18)2: an efficient amphiphilic Gd(III) chelate for the preparation of self-assembled high relaxivity MRI nanoprobes; bifunctional prochelators for coupling to bioactive peptides for radiometal labeling; DOTAGVIP(LA)anhydride, building block for prepn. of DOTVIP(LA)like chelating agents.