title: Cardiac glycosides from Cryptostegia grandiflora.
abstract: From the leaves of Cryptostegia grandiflora, four new cardiac glycosides oleandrigenin 3-O-beta-glucopyranosyl-(1-->4)-beta-cymaropyranosyl-(1-->4)-beta-digitoxopyranoside, cryptostigmin I, oleandrigenin 3-O-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranoside, cryptostigmin II, 16-propionylgitoxigenin 3-O-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranoside, cryptostigmin III and oleandrigenin 3-O-beta-glucopyranosyl-(1-->6)-beta-glucopyranosyl-(1-->4)-beta-cymaropyranosyl-(1-->4)-beta-digitoxopyranoside, cryptostigmin IV have been isolated together with two known cardenolides subalpinosid and 16-O-acetyl-digitalinum verum. The structures of the isolated compounds were verified by means of MS and NMR spectral analyses.
authors.affiliation: Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, 71526, Assiut, Egypt. mkamel@mailcity.com
authors.forename: M S
authors.initials: MS
authors.lastname: Kamel
authors.forename: M H
authors.initials: MH
authors.lastname: Assaf
authors.forename: Y
authors.initials: Y
authors.lastname: Abe
authors.forename: K
authors.initials: K
authors.lastname: Ohtani
authors.forename: R
authors.initials: R
authors.lastname: Kasai
authors.forename: K
authors.initials: K
authors.lastname: Yamasaki
mesh_terms: D029062:Apocynaceae / Q000737:chemistry*; D002301:Cardiac Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D002301:Cardiac Glycosides