2-[4-[2-[[(2R)-1-[[(10S,13R,19R)-10-(4-aminobutyl)-4-[[(2R,3R)-1,3-dihydroxybutan-2-yl]carbamoyl]-7-[(1R)-1-hydroxyethyl]-16-[(4-hydroxyphenyl)methyl]-13-(1H-indol-3-ylmethyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentazacycloicos-19-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-2-oxoethyl]-7,10-bis(carboxylatomethyl)-1,4,7,10-tetrazacyclododec-1-yl]acetate;gallium-68(3+)
Edotreotide gallium Ga-68 is an 8 amino acid peptide bound to the chelator 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA). Edotreotide gallium Ga-68 is indicated for localizing somatostatin receptor positive neuroendocrine tumors by positron emission tomography. [Dotatate gallium Ga-68] is used for a similar indication. Dotatate gallium Ga-68 has lower tumor uptake but this data is highly variable between patients.  Edotreotide gallium Ga-68 was granted FDA approval on 21 August 2019.