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Figure 8
A schematic drawing of the pedal motion. Two benzene rings only move as pedals of a bicycle as the central NH—CH plane turns upside down in the transformation from enol to the trans-keto form.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 68| Part 3| May 2012| Pages 297-304
doi:10.1107/S0108768112010993
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