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A) Type I H‐bonding pattern (β‐turn at Gly–Asp) proposed for compound 6 on the basis of spectroscopic data. The arrow indicates the NH10−NHAsp NOE contact and the dotted line represents the intramolecular hydrogen bond. B) tr‐NOESY spectrum (NH region) of compound 6 in MDA‐MB‐231 cancer cell suspension. The cross peak is relative to the NH10−NHAsp interaction.
