A substituted cyclodextrin of the formula ##STR3## in which R2, R3 and R6 each independently is an alkyl or alkenyl group having 1 to 8 carbon atoms, or a cycloalkyl group having 5 to 8 carbon atoms, orR3 may be an acyl group having 1 to 8 carbon atoms or an acyl group substituted with an aromatic hydrocarbon radical or a saturated or olefinically unsaturated aliphatic or cycloaliphatic radical ha