Chiral recognition of diketopiperazines cyclo(Pro-Gly) using (−)-epigallocatechin-3-O-gallate
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Add time:09/28/2019 Source:sciencedirect.com
Upon a formation of complexes of EGCg and cyclo(l-Pro-Gly), cyclo(d-Pro-Gly) in D2O, a chirality of cyclo(Pro-Gly) was recognized by difference of the chemical shift of 1H NMR signal for H7α, H7β,8α of the Pro residue. Judging from the crystal structures of the 2:2 complexes of EGCg and cyclo(l-Pro-Gly), cyclo(d-Pro-Gly), such a difference of the chemical shift might be due to magnetic anisotropic shielding effect by the ring current from the B ring of EGCg.
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