Storage reinforcement or the constituent null for storage deficiency reform which includes

摘要

Memory is improved or memory deficiency is corrected by compounds having the formula: …CHEM… wherein n1, n2, n3 and n4 = O to 3; R1, R2, R3 and R4 = H, loweralkyl or phenyl; R5 = H or loweralkyl; X = O or S; Ar = phenyl, substituted phenyl, pyridinyl, furanyl, thienyl, methoxy-1H-benzotriazoly, indolinyl, methoxy- indolinyl, methoxypyrimidinyl, amino-methoxy-pyrimadinyl, 1,3-benzodioxolyl, or naphthalenyl, and the pharmaceutically acceptable acid addition slats, hydrates and alcoholates thereof.