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![[Figure 3]](sf3092fig3mag.jpg)
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Figure 3
Difference Fourier maps calculated for the O4-keto and O11—H11-enol groups involved in the intramolecular hydrogen bond (a) in (Ia) and (b) in (IIa). Solid lines indicate positive values and dashed lines indicate negative values of difference electron density, with a contour level of 0.04 e Å−3. |
![[Figure 3]](sf3092fig3.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
