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An achiral Cs+ ion acts as a template in the formation of homochiral, hydrogen-bonded pentamers from a racemic isoguanosine derivative 1. The meso decamer [(D)-1]5⋅Cs+⋅[(L)-1]5 (see picture) has one homochiral pentamer composed of only (D)-1 and the other pentamer is made up of (L)-1. Such enantiomeric self-recognition does not occur for the analogous G-quartets.
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Shi et al. (2000) studied this question.
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