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Chemical structures of the thiol-reactive photochromic probes. (A) Chemical structures of the thiol-reactive spirobenzopyrans and the thiol-reactive spironaphthozaxine described in this work showing light-driven transitions between the SP and MC states. (B) Schematic representation of a previously undescribed approach for reversible optical switching of functional interactions and activities of biomolecular conjugates of spirobenzopyran.
