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A comparison of experimental (a) and calculated (b) shifts for the C=C stretch mode of 15,15′-cis spheroidene with respect to the NA values. The experimental NA frequency is 1523 cm−1 and the calculated one is 1525 cm−1. Only for the isotopomers shown is it possible to assign a transition, whereas in the other spectra the C=C stretch and Me–C=C stretch modes show too much overlap.
