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![[Figure 1]](hb7991fig1mag.jpg)
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Figure 1
Molecular structures of the title compounds (I)–(VI), showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as small spheres of arbitrary radii. In the hydrogen bonds between the carboxy O atom and the base N atom of compounds (III) ![[link]](../../../../../../logos/arrows/e_arr.gif) and (IV), the H atoms are each disordered over two positions. The nitro group in (III) is disordered around the N1—C6 bond. Dashed lines in (I), (II), (V) and (VI) indicate the N—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds. |
![[Figure 1]](hb7991fig1.jpg)
 | CRYSTALLOGRAPHIC COMMUNICATIONS |
ISSN: 2056-9890
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