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Communications ADVANCED MATERIALSbe explained by the fragmentation pattern. Typically, the [MI@ peak represents the basis peak (loo%), which additionally confirms the cyclic structure (related open chain compounds give only a low intensity of the [MI' peak).Also the [M + HI' and the [M + Na]@ peaks in the electrospray-MS correspond to the cyclic structures. N o additional peaks could he detected in the scanned ranges up to d z = 2000. Therefore, the next possible macrocycle with larger size is not present and it is reasonable to assume that other macrocycles with larger sizes are also absent. Thc purity was additionally checked by HPLC and was found to be > Y9 %.

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