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Figure 2
(Left) 2(1H)-pyrazinone, 2-pyz, (middle) 4(3H)-pyrimidinone, 4-pym, and (right) 4(3H)-quinazolinone, 4-quz.

IUCrJ
Volume 5| Part 1| January 2018| Pages 13-21
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517015494