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(a) MePip catalyzed Michael reaction between PhSH and CycHex in MCH*. (b) Time-dependent absorption changes of 10 μM solutions of Zn-1 containing 10 mM PhSH, 10 mM CycHex, and 0.5 mM MePip. In the ambient sample, [H2O] = 30.0 ppm, and in the dry sample [H2O] = 11.4 ppm.
