To determine the contents of different substances in complex mixture, quantitative 1H NMR spectroscopy can also be used. NMR spectroscopy provides high selectivity and absolute quantification of specific compound in a mixture by using an internal standard (IS) reference material [19–21]. The magnitude of the NMR peak is directly proportional to the number of nuclei and the molar concentration of the sample. Based on this intensity relationship, the concentration of the analyte can be measured by quantitative 1H NMR using the ratio between the integral value of the sample’s specific chemical shift and that of the IS [19–21]. Previous studies have demonstrated the advantages of quantitative 1H NMR such as reduced measurement time, simple sample preparation, and a small volume requirement compared to conventional analysis techniques [19–24]. Additionally, NMR analysis has further advantages of containing chemical structure information and providing nondestructive analytic test [19–24]. Owing to these benefits, quantitative 1H NMR has been adopted to quantify the specific component of crude samples, such as urine, processed foods, and tablets [19–21,23,25]. Based on these strengths, we applied the NMR method to quantify the absolute content of cyclic component in a mixture.