| 摘要 |
Xanthene derivatives of formula (I) wherein A signifies methylene, carbonyl or thiocarbonyl, R represents an amino group, either unsubstituted or mono- or di-substituted by monovalent aliphatic and/or araliphatic radicals, or disubstituted by divalent aliphatic radicals, and R1, R2, R3 and R4, independently of one another, denote hydrogen, lower alkyl, lower alkoxy, halogen or trifluoromethyl, and their pharmaceutically employable salts, may be used as anti-neurodegenerative active ingredients for medicaments. The invention also relates to new compounds of formula (I). |
