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Fig. S1 Polyhedral view of the 24-atom ring encapsulating 2-methylpiperazine. N and C atoms are displayed as blue and white balls, respectively. [ZnO ] and [CPO 5/6 3 ] are indicated by green and yellow polyhedrons, respectively.doi:10.1039/b909015k pmid:19859599 fatcat:22yo5t3frjfxbnn5ol3fh2zada