Glycosides are widely occurring natural compounds. Among them, ergotalkaloids, therapeutically potent substances,1 have been isolated only as mono-2-4 and oligofructosides.4,5 The formation of these metabolic by-products in saprophyticcultures of some Claviceps strains grown in sucrose media is catalysed by invertase present in fungal mycelia.3 The other O-glycosides of ergotalkaloids, obtained