In order to further verify whether the sandwich complex stabilized by hydrogen bonding and π•••π stacking, shown in Fig. , would lead to enhancement of the stereoselectivity, we investigated another organocatalytic system: L-pipecolic acid with a backbone of (R,R)-1,2-diphenylethylenediamine, which catalyses the asymmetric nitroaldol reaction reaction.This has been experimentally investigated by Feng and coworkers. The reason for choosing this particular case, as explained in the Introduction, was because different nitrophenol substituted additiveswere investigated in the experimental report, and different enantioselectivities were obtained forthe different cases.2,4-dinitrophenol was experimentally found to be the best aromatic additive,leading to the highest enantioselectivity (entry 1 in Table ), followed by 4nitrophenol, phenol and 2,4,6-trinitrophenol.These experimental results provide us with an opportunity to evaluate the robustness of our proposed model: if the trend obtained for the enantioselectivity from our proposed model matches the reported experimental trend, this experimental report would serve as a validation of the newly proposed model.