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Molecular structure and conformation for nitroxide tetraradical 1 (left) and diradical 2 (right) with constrained conformations of 1,3-alternate calix[4]arene. Carbon, nitrogen, and oxygens atoms are depicted with thermal ellipsoids set at the 50% probability level. Only one of the two unique molecules of 2 and without the solvent of crystallization (benzene) is shown.
