D 0765 (OTTO) DOTAGA-tertra(tBu-ester) >99%,cas-306776-79-4, 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; DOTAGA-anhydride, building block for prepn. of DOTA-like chelating agents.