For limonene we could show that for the specific optical rotation
at 589, the ORD values and VCD bands no sign change occurs if a
number of reasonable levels of theory are applied. However, the
ECD data cannot be used successfully since the AC assignment
depends on the basis sets applied. In addition, the absolute value of
the experimental specific optical rotation is larger than 60, and the
ORD curve with 4 wavelengths show no zero crossing so that all
chiroptical methods except ECD (specific optical rotation > 60, ORD,
and VCD) can be applied for the AC assignment.