The 1H and 13C NMR Chemical Shift Assignments for Thirteen Bufadienolides Isolated from the Traditional Chinese Drug Ch'an Su

Abstract

The 1H and 13C NMR spectra of thirteen natural bufadienolides, which were isolated from the Chinese drug Ch'an Su, were assigned using a combination of 2D NMR spectra that included 1H-1H COSY, NOESY, HMQC, and HMBC techniques.