Sulfonated triterpenoid saponins from Fagonia indica

Two new triterpenoid saponins, 3-O-{[beta-D-4-O-sulfonylglucopyranosyl-(1-- >3)]-alpha-L-arabinopyranosyl}-ursolic acid-28-O-[beta-D-glucopyranosyl] es ter (indicasaponin C) and 3-O-{[beta-D-4-O-sulfonylglucopyranosyl-(1-->3)]- [beta-D-xylopyranosyl-(1-->2)]-alpha-L-arabinopyranosyl}ursolic acid-28-O-[ beta-D-glucopyranosyl] ester (indicasaponin D) have been isolated from Fago nia indica. The structures were determined primarily by NMR spectroscopy, T he assignment of NMR signals was performed by means of H-1-H-1 COSY, NOESY, ROESY, TOCSY; HMQC and HMBC experiments.