Improved ultra‐performance liquid chromatography with electrospray ionization quadrupole‐time‐of‐flight high‐definition mass spectrometry method for the rapid analysis of the chemical constituents of a typical medical formula: Liuwei Dihuang Wan
National TCM Key Lab of Serum Pharmacochemistry, Key Lab of Chinmedomics, Department of Pharmaceutical Analysis, Heilongjiang University of Chinese Medicine, , Harbin, China