| 摘要 |
Title compd. of formula (I) and its acid addn. salt, useful as antihistamines and inhibitors of mediator release are prepd. In (I), R1, R2 and R3 are each H, lower alkyl, hydroxyl, lower alkoxy, lower alkanoyloxy, lower alkanoyl, halogen, nitro, cyano, lower alkoxycarbonyl, di (lower alkyl) amino, lower alkylthio or trihalomethyl; R4 is H, C1-12 alkyl, C3-8 cycloalkyl, allyl, phenyl or substd. phenyl; n is 1,2,3 or 4; m is 1; P is 2, 3 or 4; X is O or S.
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