Our finding of the barrierless ballistic C6-puckering mechanism of photoexcited 9H 2,6-dAP is inconsistent with the calculations performed by Oliveira et al., who found a high barrier with a peak exceeding the vertical excitation energy of the ππ* La state by 0.08 eV. However, similar to our results, the C6-puckered S 1 /S 0 conical intersection of 9H 2,6-dAP obtained at the MS-CASPT2/SA-CASSCF level is also lower in energy than the vertical excitation energy ot the ππ* La state. It is also important to emphasize that Oliveira et al. incorrectly associated this energy barrier with the barrier of 400 cm -1 (0.05 eV) observed in our experiments. Specifically, our measurements allowed us to estimate the barrier above the 0-0 transition of 9H 2,6-dAP, which can be associated with the adiabatic excitation energy of the S 1 state of the molecule and not with the vertical excitation energy as interpreted by Oliveira et al. The actual barrier height computed by Oliveira et al. amounts to 0.57 eV above the energy of the 0-0 transition, which substantially exceeds the measured value. Finally, to reiterate, since we were able to demonstrate this barrierless C6-puckering mechanism at the NEVPT2/SA-CASSCF level, we anticipate that the presence of this high energy barrier in the calculations performed at the MS-CASPT2/SA-CASSCF level might be an artifact of the geodesic interpolation procedure, which should be validated in the future.