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Molecular models of cttctt-and tttttt-conformers of macrocycle 11a. The macrocycle was modeled as simplified homologue 11a' in which the propyloxyammonium side chains (R = CH2CH2CH2NH3+) were replaced with methoxy groups (R = Me). Structures represent the lowest energy cttctt-and tttttt-conformers identified from 1000 Monte-Carlo conformational search steps.
