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Molecular structures of one of the molecules in the asymmetric unit in (left) 12 and (right) 13. Ellipsoids at 30% level. In 12, the minor disordered component and hydrogens, with the exception of those attached to C7, have been omitted for clarity. In 13, the minor disordered component and hydrogens, with the exception of those attached to C6, have been omitted for clarity.
