Ascidiacyclamide at 90 K
cyclo(-Ile-Oxz-D-Val-Thz-)2 from benzene solution
The structure of ascidiacyclamide was reported by Ishida et al. Chem.Commun.
370 (1987) and Ishida et al. J.Org.Chem. 53, 107 (1988), and registrated in
CSD (REFC=FAZJUL and FAZJUL10).
However, the reflection data were measured at 90 K by Bruker SMART APEX CCD
detector again. The low temperature condition and high number of reflections
resulted a better strucutre. Especially, the benzene molecules are well
refined.
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Figures are produced by Rasmol and POVray3
Table 1. Crystal and experimental data for Acidiacyclamide
Formula C36H52N8O6S2,2(C6H6) Mr 913.19
Crystal system monoclinic Space group C2
a, A 15.2584(13) a, deg 90
b, A 13.2672(11) b, deg 100.42(10)
c, A 12.6353(11) g, deg 90
V, A3 2515.7(4) Z 2
T, K 90 Dx, g cm-3 1.206
F(000) 976 mu, mm-1 0.160
X-ray source Mo Ka lambda, A 0.71073
No. of reflx obs 14019 R(int) 0.0184
No. of reflx used 5777 No. of para 301
R 0.0738 wR 0.1887
Flack x 0.04(13) (D/s)max 0.014
Drmax, e A3 0.663 Drmin, e A3 -0.364
If you hope to calculated sigma-a map (electron density map) on your computer,
get 'LIST 6' reflection list (FCF: ASCII 92KB). SHELXPRO produces sigmaa.map from PDB and FCF files.
Otherwise, download DN6 map (928 KB binary). This
map works for Swiss-PDB Viewer on Macintosh and Windows. (FTP server is off
on this server. Try both IE and Netscape for download. I guess IE dowload
manager is smart.)
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