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Matrine and oxymatrine were extracted fromSophora flavescens, and their1H and13C nuclear magnetic resonances (NMR) were unambiguously assigned by a combination of different two-dimensional 2-D1H-13C and1H-1H correlation experiments of HMQC, HMQC-TOCSY and MAXY. The technique of using those experiments to make the assignment of the heavily overlapped spectrum is demonstrated. The coupling constants...
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