The present patent application discloses compounds of the formula ##STR1## wherein R.sup.1 is C.sub.1-10 saturated or unsaturated alkyl; or ##STR2## wherein R'" is H or ##STR3## R.sup.2 is phenyl which is unsubstituted or substituted one or more times with halogen, CF.sub.3, C.sub.1-6 -alkoxy, NO.sub.2, CO.sub.2 --C.sub.1-6 -alkyl, methyl; benzyl which may be substituted one or more times with halogen, CF.sub.3, C.sub.1-6 -alkoxy, NO.sub.2, CO.sub.2 --C.sub.1-6 -alkyl, methyl; pyridyl; or cyclohexyl;R.sup.3 phenyl which is unsubstituted or substituted one or more times with halogen, CF.sub.3, C.sub.1-6 -alkoxy, NO.sub.2, CO.sub.2 --C.sub.1-6 -alkyl, methyl; naphthyl which may be substituted one or more times with halogen, CF.sub.3, C.sub.1-6 -alkoxy, NO.sub.2, CO.sub.2 --C.sub.1-6 -alkyl, methyl; pyridyl; C.sub.1-6 unsaturated alkyl; furanyl;R.sup.4 is H, C.sub.1-6 -alkyl, or benzyl; or ##STR4## together form ##STR5## R' and R" are each hydrogen or together form an extra benzo ring; and wherein the dotted line represents an optional extra bond between the two carbon atoms designated .alpha. and .beta.,or a pharmaceutically-acceptable addition salt thereof.The compounds are useful as pharmaceuticals, for example in the treatment of Ca overload in brain cells.