We thank the Skaggs Research Foundation and the National Institutes of Health for support. We also thank Dr. Tomas Szabo for advice on the synthesis of protected glycolurils. Administración de Fomento Económico of Puerto Rico provided fellowship support to J.M.R. The Ministerio de Educación y Cultura of Spain provided fellowship support to T.M.
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Rivera et al. (1998) studied this question.
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