This invention relates to inclusion compounds of cyclodextrin with the compounds of the general formula [I] and salts thereof, which show pharmacological effects (for example antihypertensive effect), ##STR1## wherein A is straight or branched lower alkylene;R.sup.1 is hydrogen or lower alkyl;R.sup.2 is hydrogen, lower alkyl, phenyl, phenyl-lower alkyl, hydroxyphenyl-lower alkyl, hydroxy-lower alkyl, amino-lower alkyl, guanidino-lower alkyl, imidazolyl-lower alkyl, indolyl-lower alkyl, mercapto-lower alkyl or lower alkylthio-lower alkyl;R.sup.1 or R.sup.2 may join to complete pyrrolidine ring or thiazolidine ring, and each ring may be substituted by phenyl or pyridyl, and phenyl may be resubstituted by hydroxy, lower alkoxy, halogen, nitro or sulfamoyl;R.sup.3 is hydrogen or ##STR2## said lower alkyl and lower alkoxy having 1 to 6 carbon atoms.