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Structure of cyclochivinoside C from Astragalus chivensis

“…The configuration of the asymmetric center at C-24 of 2 was determined by comparing 13 C NMR spectra of 2 and cyclounifolioside C [4]. The resonance for this C atom in the 13 C NMR spectrum of cyclounifolioside C, which has the C-(24R)-configuration, occurred at 80.29 ppm whereas in the spectrum of 2 this resonance shifted to strong field by 3.08 ppm (77.21 ppm).…”

Cyclochivinoside B from the aerial part of Astragalus chivensis

“…These data and the elemental formula C 42 H 72 O 15 enabled us to classify unambiguously 2 as a cycloartane triterpenoid. Acid hydrolysis of 2 gave the genin, which was identified using spectral data and the literature as cyclocanthogenin (3) [3,4].…”