Figure 6. Experimental available Infrared spectra of chloroquine in solid phase [1] compared with the predicted for the S(-) and R(+) forms in gas phase by using the hybrid B3LYP/6-311++G** method. Figure 7. Predicted Raman spectra for the S(-) and R(+) forms in gas phase by using the hybrid B3LYP/6-311++G** method.