| 摘要 |
This invention relates to novel compounds of the formula: <IMAGE> <IMAGE> wherein X is H, methoxy, bromine or chloro; R1 is hydrogen or hydroxy, acyloxy wherein acyl is 2 to 8 carbon atoms, R2 is hydrogen, hydroxy, methyl, fluoro or chloro; and R1 and R2 taken together can be <IMAGE> R3 is hydrogen, methyl, chloro, or fluoro; R4 is hydrogen, chloro or fluoro; R5 is oxygen, beta -hydroxy or beta -chloro, with the proviso that when R5 is beta -chloro then R4 must be chloro.
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