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From the aerial parts of Verbascum (V.) sinaiticum, V. thapsiforme, V. fruticulosum and Celsia roripifolia, seven new saikosaponin homologues, called mulleinsaponins I-VII, having 13,28-epoxy-olean-11-ene skelton were isolated together with eight known saikosaponin homologues, 3-O-beta-D-fucopyranosyl saikogenin F, saikosaponin a, desrhamnosylverbascosaponin, songarosaponins C, D, mimengoside A and buddlejasaponins I, IV. The structures of mulleinsaponins I-VII were characterized as 3-O-beta-D-glucopyronosyl-(1--&gt;3)-beta-D-fucopyranosyl-6-deoxy- saikogenin F, 3-O-alpha-L-rhamnopyranosyl-(1--&gt;4)-beta-D-glucopyranosyl-(1--&gt;3)-beta-D - fucopyranosyl-16-deoxysaikogenin F, 3-O-alpha-L-rhamnopyranosyl-(1--&gt;4)-beta-D-glucopyranosyl-(1--&gt;3)-beta-D - fucopyranosyl-saikogenin F, 3-O-alpha-L-rhamnopyranosyl- (1--&gt;4)-beta-D-glucopyranosyl-(1--&gt;3)-[beta-D-glucopyranosyl-(1--&gt;2)]-be ta -D-fucopyranosyl-21 beta-hydroxysaikogenin F, 3-O-alpha-L-rhamnopyranosyl-(1--&gt;4)-beta-D-glucopyranosyl-(1--&gt;3)-[beta- D- glucopyranosyl-(1--&gt;2)]-beta-D-fucopyranosyl-21 beta-acetoxysaikogenin F, 3-O-alpha-L-rhamnopyranosyl-(1--&gt;4)-beta-D- glucopyranosyl-(1--&gt;3)-[beta-D-glucopyranosyl-(1--&gt;2)]-beta-D- fucopyranosyl-16 beta-acetoxysaikogenin F and 3-O-alpha-L-rhamnopyranosyl-(1--&gt;4)-beta-D-glucopyranosyl- (1--&gt;3)-[beta-D-glucopyranosyl-(1--&gt;2)]-beta-D-fucopyranosylsaikogeni n F 16-O-beta-D-glucopyranoside, respectively, from chemical and spectroscopic evidence.

Saikosaponin Homologues from Verbascum spp. The Structures of Mulleinsaponins I-VII.