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we have synthesized the new oxa-aza macrocycle 1,4-dioxa-7,- 10,13,16,19-pentaazacyclohenicosane ([21]aneN502, n = 1, R = H). we have analyzed the coordination ability toward Cu(II), Zn(II), Cd(II), and Pb(II) of the macrocycle cited above.
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Andrés et al. (1994) studied this question.
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