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![[Figure 1]](sk3557fig1mag.jpg)
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Figure 1
The C—N distance (Å) versus the average C—N—H angle (°) in the structures retrieved from the Cambridge Structural Database [CSD; Version 5.34 of November 2012, with updates from February and May 2013 (Allen, 2002  ); 547174 hits], as well as in the title structures. The horizontal lines at about 109.54 and 120° are a clear geometry-constraint artifact. The title structures are indicated by coloured symbols. The plot was constructed using Origin6.1 (OriginLab Corporation, 2000). |
![[Figure 1]](sk3557fig1.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
