| 摘要 |
Compounds of the formula <IMAGE> wherein (a) R1 is hydrogen, lower alkyl, lower alkoxy or 8-halo; R2 is hydrogen, lower alkyl, lower alkoxy or a fused benzene ring; and R3 and R4, together with each other, are -N=N-NH-; or (b) R1 and R2, together with each other, are -N=N-NH-; R3 is hydrogen, lower alkyl, lower alkoxy, 2-halo, 3-halo or 4-halo; and R4 is hydrogen, lower alkyl, lower alkoxy or a fused benzene ring; and non-toxic, pharmacologically acceptable salts thereof formed with an inorganic or organic base. The compounds as well as their salts are useful as antiallergics.
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