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Amide and aromatic region of the 1D proton NMR spectra of analogues des-AA1,4-6,11-13-[DPhe2, DTrp8]-SRIF-Thr-NH2 (octreotide amide) (11), 16, 23 and 27. The chemical shift dispersion of the aromatic region of analogs 11 and 16 are comparable, while that of 23 and 27 suggests that these peptides are less structured in DMSO compared to analogues 11 and 16.
