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The central rotor (subunits D, F, C and the L-ring) is rotated by 0° (a), 120° (b) and 240° (c) about the central axis through the L-ring (as indicated) relative to the (AB)3 ring. The central axis through the centre of the (AB)3 ring is inclined with respect to the central axis through the L-ring (∼6° tilt).
