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Rapid resolution liquid chromatography coupled with quadruple–time-of-flight mass spectrometry chromatograms for extracts obtained from different cultivation regions. (A) Extracted chromatogram of Re, Rb1, Rc, and Rd. The quasimolecular ion peak of Re, Rb1, Rc, and Rd, respectively, at m/z 991.55, 1,153.60, 1,123.58, and 991.53. (B) Extracted chromatogram of Rg1. The quasimolecular ion peak of Rg1 at m/z 845.49.
