prov:value
| - A compound of formula I according to claim 1 wherein R1 is hydrogen, lower alkyl or lower alkoxy-lower alkyl, R2 is lower alkenoyl or halo-lower alkanoyl, or, when R1 is lower alkoxy-lower alkyl, R2 may also be hydrogen, R3 and R4 are each hydrogen, R5 is chlorine, R6 is hydrogen, X is a direct bond and Y is 1,2-ethylene, or a pharmaceutically acceptable salt thereof.
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