Previous interactive molecular dynamics in virtual reality studies identified a diffusion bottleneck for methyl n-hexanoate in ZSM-5, created by a 10-membered ring in the straight pore. Furthermore, Cnudde et al. demonstrated that diffusion of longer chain hydrocarbons through similar rings is more hindered than short chains, due to reduced conformational freedom. Consequently, this bottleneck hinders the diffusion of the longer alkyl chain promoters to a greater extent, reducing their preference for diffusion through the straight pore, and reducing their overall rate of diffusion within the 3D pore network.