| 摘要 |
A compound of the formula:wherein R1 represents a lower alkyl; R2 represents H, an optionally substituted alkyl or an optionally substituted alkenyl; R3 and R4 each represents an optionally substituted lower alkyl or a lower alkoxy, or R3 and R4 form, taken together, an optionally substituted butadienylene; and X1 and X2 each represents an optionally esterified or etherified hydroxy, or a salt thereof is useful for protecting cells from the cytotoxicity of beta-amyloid protein. |
