Studies on the Constituents of Orchidaceous Plants. IV. : Proton and Carbon-13 Signal Assignments of Cycloeucalenol-Type Triterpenes from Nervilia purpurea SCHLECHTER by Two-Dimensional Nuclear Magnetic Resonance Spectroscopy

Abstract

The proton and carbon-13 nuclear magnetic resonance (NMR) signals of cycloeucalenol (1a), cycloeucalenol acetate (1b), cyclonervilol (2a), cyclonervilol acetate (2b), and cyclohomonervilol acetate (3b), isolated from Nervilia purpurea, were assigned by means of two-dimensional NMR spectroscopy.