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Structures of nitroxide tetraradical 1a, diradical 1b, and monoradical 1c derivatives of 1,3-alternate calix[4]arene, pegylated nitroxide diradicals 2a and 2b, and azine diradical 3. The small amount of monoradical that is present in samples of 2a is designated as 2a_mono. monoradical formed by partial reduction of 3 is designated as 3_mono.
