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Requesting your help with the following article:
Applications of quantitative 1H- and 13C-NMR spectroscopy in drug analysis
L.A.C. Pieters, a and A.J. Vlietinck
Journal of Pharmaceutical and Biomedical Analysis 7(12):1405 (1989)
doi: http://dx.doi.org/10.1016/0731-7085(89)80145-1