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. 2022 Oct 27;14(21):4554. doi: 10.3390/polym14214554

Table 2.

NMR shifts in deuterated DMSO of αCH and βCH protons of DKPs 1–4. Values in bold indicate upfield shifts due to intramolecular CH-π interactions.

DKP Sequence αCH Phe αCH Leu βCH2 Phe βCH2 Leu
DKP1 Cyclo(L-Leu-L-Phe) 4.16 3.47 3.13, 2.83 0.76, 0.12
DKP2 Cyclo(D-Leu-L-Phe) 4.15 2.88 3.13, 2.88 1.45, 1.35
DKP3 Cyclo(L-Leu-D-Phe) 4.15 2.88 3.13, 2.88 1.45, 1.35
DKP4 Cyclo(D-Phe-L-Phe) 3.38 - 3.00, 2.72 -
- Cyclo(L-Phe-L-Phe) 1 3.95 - 2.55, 2.20 -

1 Data from ref. [31].