title: Thin-layer chromatographic study of the steroidal and cardinolide constituents of Penstemon species of North Dakota.
mesh_terms: D000112:Acetyldigitoxins / Q000302:isolation & purification; D002297:Cardanolides / Q000302:isolation & purification*; D004077:Digoxin / Q000302:isolation & purification; D007799:Lanatosides / Q000302:isolation & purification; D009658:North Dakota; D010042:Ouabain / Q000302:isolation & purification; D010946:Plants, Medicinal / Q000032:analysis*
chemical_list: D000112:Acetyldigitoxins; D002297:Cardanolides; D007799:Lanatosides; D010042:Ouabain; D004077:Digoxin