This analysis prompted the division of space within the SMART cavity into proximal vs distal with respect to the rhodium. Excluding the large, distal portion of the pocket allows for focused parametrization of the proposed active space of the cavity for the diastereoselectivity determining step. To accomplish this, a sphere was centered 2.0 Å from the rhodium (along the Rh-Rh vector) to simulate the position of a bound donor/donor carbene. The proximal cavity space was then separately parametrized from the full space.