(CHs);CC(C6H5)3 2(CHs);C Time, t (sec) C/Co for hexaphenylethane 1.000 17.4 0.941 35.4 0.883 54.0 0.824 174.0 0.530 209 0.471 313 0.324 367 0.265 434 0.206 584 0.118 759 0.059

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