The lowest energy excitation in B1 was calculated to be at 418.5 nm, similar to that of the isolated chromophore. There is only one NTO pair for each excitation for B1, with an amplitude above 90%, which indicates little electronic coupling between A1 and A2 when combined. The oscillator strengths for the 416.3 nm excitation in A1 and the 418.5 nm excitation in B1 are 0.8785 and 0.8680, respectively. Thus, the binding of the pillar to the chromophore moiety should have no effect on the absorbance.