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(A) Schematic representation of DOTA-OP3-4 with Gd3+ conjugate (DOTA-Gd-OP3-4); (B) Chromatographic separation profile of the purified DOTA-Gd-OP3-4. The ITMS spectra of the ions eluted in peak 1 (putative peptide) and peak 2 (contaminating fraction) are also shown (bottom). The purity of the peptide, estimated by integration of the peak areas, was >90%.
