Figure 4: Proposed structure for [7]-rotaxane 9.
From: Making hybrid [n]-rotaxanes as supramolecular arrays of molecular electron spin qubits

The proposed formula for this compound is [Fe2Co(μ3-O)(O2CtBu)6{CH2{Cr7Ni(μ-F)(O2CtBu)16}2}3]; colour code as Fig. 2.