Short-RInChIKey=SA-FUHFF-UHFFFADPSC-XKOXVLDNAL-UHFFFADPSC-NUHFF-NMBEL-NUHFF-ZZZ

The precursor used for this conversion was obtained from the reaction: https://www.chemotion-repository.net/pid/13201The crude macrocycle tert-butyl 3-((3S,6S,9S,14aR)-6-(4-(tert-butoxy)benzyl)-9-(sec-butyl)-1,4,7,10-tetraoxotetradecahydropyrrolo[1,2-a][1,4,7,10]tetraazacyclododecin-3-yl)propanoate (33.0 mg, 53.7 μmol, 1.00 equiv) was dissolved in 4.50 mL 95% trifluoroacetic acid in 0.5 mL of dichloromethane and stirred for at least 1 h. The solvent was removed under air stream and the residue was dissolved in a mixture of acetonitrile and water.