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(a) Structures of photochromic diarylethenes as guest molecules (DAE, DAE-Male1, DAE-Male2, DAE-Male3, and DAE-NHS). (b) Structure of a cucurbit[7]uril host molecule (CB7). (c) DFT-optimized geometry and the photoswitching reaction of the DAE@CB7 complex. The cylinder of a DAE@CB7 complex has a length of 2.4 nm and a diameter of 1.3 nm.
