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(a–c) Sections of the 1H, 15N-DEPT-135 and 31P spectra of a 1:1 complex of (R)-TRIP and 5 (CD2Cl2, 180 K, 600 MHz), clearly showing the coexistence of both E and Z complexes; (d) chemical shifts of (R)-TRIP·5E/Z; (e) chemical shifts of unbound 5.
