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Structure of benzyloxycarbonyl-l-isoleucyl-l-alanyl-α-aminoisobutyryl-α-aminoisobutyrate methyl ester, Z-l-Ile-l-Ala-Aib-Aib-OMe

✍ Scribed by Taga, T. ;Hourai, S. ;Machida, K. ;Fujita, T. ;Ichihara, T.

Book ID: 114508132
Publisher: International Union of Crystallography
Year: 1991
Tongue: English
Weight: 341 KB
Volume: 47
Category: Article
ISSN: 0108-2701
DOI: 10.1107/s0108270190013403

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## Abstract The crystal and molecular structures of two α‐aminoisobutyric acid (Aib)‐containing diketopiperazines, cyclo(Aib‐Aib) 1 and cyclo(Aib‐L‐Ile) **2**, are reported. Cyclo(Aib‐Aib) crystallizes in the space group P1 with __a__ = 5.649(3), __b__ = 5.865(2), __c__ = 8.363(1), α = 69.89(6), β

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## Abstract Boc‐Gly‐L‐Ala‐Aib‐OMe (**1**) crystallizes in the space group __P__2~1~2~1~2~1~ with __a__ = 10.043(3), __b__ = 11.590(5), __c__ = 16.779(1) Å, and __Z__ = 4 (__R__ value for 1859 symmetry independent reflexions: 0.043). On the basis of a 4 → 1 intramolecular hydrogen bond, the tripepti