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# Structure of cyclo(\alpha- Aminoisobutyryl-L-phenylalanyl-), $C_{13}H_{16}N_2O_2$

Suguna, K and Ramakumar, S and Nagaraj, R and Balaram, P (1985) Structure of cyclo(\alpha- Aminoisobutyryl-L-phenylalanyl-), $C_{13}H_{16}N_2O_2$. In: Acta Crystallographica Section C: Crystal Structure Communications, 41 (2). pp. 284-286.

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## Abstract

$M_r$ = 232.27, monoclinic, ${P2}_1$ a = 9.646 (4), b = 6.133 (3), c = 10.757 (6) A, \beta = 101.97 (4) deg, U = 622.5 $A^3$, Z = 2, $D_ m$ = 1.25, $D_ x$ = 1.24 Mg $m^{-3}$, \lambda(Cu K \alpha) = 1.5418 A, \mu = 0.605 ${mm}^{-1}$, F(000) = 248, room temperature, R = 0.065 for 820 significant reflections. The peptide units are planar. The diketopiperazine ring assumes a flat boat conformation. The phenylalanyl ring shows a folded geometry with $x^1$ = 64.6 (7) and $x^2$ = 96.4 (7) deg.

Item Type: Journal Article http://dx.doi.org/10.1107/S0108270185003... Copyright for this article belongs to International Union of Crystallography. Division of Biological Sciences > Molecular Biophysics UnitDivision of Physical & Mathematical Sciences > Physics 04 Mar 2005 19 Sep 2010 04:18 http://eprints.iisc.ernet.in/id/eprint/2873

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