In order to apply Eq. ( ), one must solve for the response amplitudes t m ζ at zero frequency, whereas solving for the Njj ′ multipliers is necessary for Eq. (7). Since the t m ζ (0) vectors are also involved in the calculation of the B term (and do not scale with the number of excited states), it is advantageous to use Eq. ( ) to obtain the MCD A term. Details on the implementation of the contractions needed to evaluate the above quantities for RI-CC2 in TURBOMOLE can be found in Refs. 43,44.