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198 Topics in Current Chemistry Editorial Board: A. de Meijere KN ...

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114 R.E. Melén<strong>de</strong>z · A.D. Hamilton<br />

20 21<br />

Fig. 17. Dimers and ribbons formed by asymmetric 20 and symmetric dipyridones 21<br />

b<br />

a<br />

Fig. 18 a, b. Lactam 22 has potential to form: a cyclic hexamer <strong>in</strong> pure enantiomeric form;<br />

b ribbon when (+) and (–) units alternate<br />

22

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