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Structures of the N‐to‐C‐terminus ‘straight’ sequence DS‐70 of its partially retro‐analogue DS‐23 and the well‐known α4β1 antagonist BIO1211, showing a first inversion of the sequence between the diphenylurea group and the C‐to‐N oriented β2‐Pro and a second inversion between the latter and the malonate.
