Upon internal conversion through a conical intersection, molecules might proceed to form photoproducts, or they might revert to the reactant basin. There have been numerous discussions of the influence of conical intersection topography on the branching ratio between photoproducts and photoreactants, i.e., the photochemical quantum yield . When the intersection topography is peaked, the formation of photoproduct and photoreactant are both feasible. Thus, if the velocity is sufficiently randomized (i.e., the molecule has lost memory of its origin in the Franck-Condon region), one might expect a photochemical quantum yield of 50%. This is more or less observed in the simulated dynamics proceeding through the seam of the MECI, which is typically associated with electrocyclic ring-opening in CHD-like molecules (ring-opening CI, RO-CI). However, all three systems under study exhibit two additional MECIs that are distinct from the RO-CI. These additional MECIs are characterized by strong out-of-plane bending of the ring substituent at either end of the conjugated π-system of the reactant (out-ofplane CI, OOP-CI). Due to its C2v symmetry, the two OOP-CIs are degenerate in CHD.