| 摘要 |
2092429 9205176 PCTABS00011 A compound of formula (I) or, if appropriate, a pharmaceutically acceptable salt thereof; or a pharmaceutically acceptable solvate thereof, wherein R1 and R2 each independently represent a moiety of formula (a): -(CH2)m-A, wherein m represents zero or an integer 1, 2 or 3 and A represents a substituted or unsubstituted cyclic hydrocarbon radical; R3 represents substituted or unsubstituted aryl or a substituted alkyl group; R4 represents hydrogen or a group -CO.R5, wherein R5 represents substituted or unsubstituted alkyl or substituted or unsubstituted aryl; or R3 together with R5 represents a substituted or unsubstituted C2-3 polymethylene chain; and A1 represents hydrogen or substituted or unsubstituted alkyl; a process for preparing such a compound, a pharmaceutical composition containing such a compound and the use of such a compound or composition in medicine.
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