| 摘要 |
The invention relates to compounds of the formula <IMAGE> I and <IMAGE> II wherein R1 is hydrogen or lower alkyl; R2 is hydrogen or halogen; R3, R4 and R5 are hydrogen, acyl or lower alkyl; R6 and R7, independently, are hydrogen or lower alkyl; X is alkylene3-7; and n is an integer of zero to four; provided that only one of R3, R4 or R5 can be acyl; enantiomers thereof, and, when R7 is hydrogen, salts thereof with pharmaceutically acceptable bases. The compounds of formulas I and II are useful as agents for the treatment of allergic conditions.
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