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From our computational results, we explain the observed unusual dependence of the rate constant of covalent complex formation, kobs, on the ARS concentration. The latter depends both on the non-covalent binding step with the equilibrium constant, Ki, and on the rate constant of covalent adduct formation, kinact. The calculated ratio kinact/Ki = 213 M-1 s-1 reproduces the corresponding experimental value of 250 ± 30 M-1 s-1 for the interaction of ARS-853 with KRASG12C. Electron density analysis in the reactive region demonstrates that
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