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2. Two chiral zeolites are known. However, both of them are polymorphic and retain handedness only over a few crystallographic layers: Newsam, J. M.; Treacy, M. M.; Koitsier, W. T.; de Gruyter, B. Proc. R. Soc. London, Ser. A 1988, 420, 375; Anderson, M. W.; Terasaki, O.; Ohsuna, T.; Philippou, A.; MayKay, S. P.; Ferraira, A.; Rocha, J.; Lidin, S. Nature 1994, 367, 347.
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4. Holý, P.; Závada, J.; Cı́sařová, I.; Podlaha, J. Angew. Chem., Int. Ed. Engl. 1999, 38, 381.
5. A pertinent example of the infinite homochiral network has been recently reported: Vojtı́šek, P.; Cı́sařová, I; Podlaha, J.; Žák, Z.; Bohm, S.; Tichý, M.; Závada, J. Z. Kristallogr. 1997, 212, 226.