Figure : a)The first 5 singlet states calculated at ADC(2)/def2-TZVP and with the top three selected functionals for spiropyran bearing no substituent (left) and a nitro group on the chromene moiety (right). The color of the boxes represent the states with same character, the intensity of the filling of the boxes is proportional to the intensity of the transitions,the dashed lines connect the matching state to the reference ADC(2). Predicted and calculated (in parenthesis) scores are reported for each functional.