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(a) λmax values of cages 1−4 in six solvents. (b) Photographs of cage 1, cage 2, cage 3 and cage 4 (from top to bottom) in six solvents. Dio, dioxane; EA, ethyl acetate; THF, tetrahydrofuran; DCM, dichloromethane; EtOH, ethanol; MeOH, methanol.
