Composition for inhibiting production or secretion of amyloid .beta. protein to treat Down's syndrome

Abstract

A pharmaceutical composition for inhibiting production or secretion of amyloid .beta. protein, which comprises a compound of the formula (I): ##STR1## wherein ring A is an optionally substituted benzene ring, R represents OR.sup.1, ##STR2## or SR.sup.1, wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different and each is selected from a hydrogen atom, an optionally substituted hydrocarbon group or R.sup.2 and R.sup.3, taken together with the adjacent nitrogen atom, form an optionally substituted nitrogen-containing heterocyclic group, and Y is an optionally substituted alkyl group, or a pharmaceutically acceptable salt thereof, if necessary, with a pharmaceutically acceptable excipient, carrier or diluent.

Dependencies are inferred from the claim text.