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(a) Superimposition of single-crystal XRD structures of homochiral cyclo(Tyr-Leu) (green, [49]) and cyclo(Phe-Phe) (cyan, [31]), highlighting the βCH-π interaction (dashed black line). (b) Superimposition of single-crystal XRD structures of heterochiral DKP2 (green CCDC 2209459) and DKP4 (cyan, CCDC 2209458) highlighting the αCH-π interaction (dashed black line).
