| 摘要 |
Antihistaminic compounds, process for their preparation and pharmaceutical compositions containing them The present invention relates to terfenadine derivatives of formula <IMG> (I) where R1, which is in position 1 or 2 of the tetrazole ring, stands for H, or a linear or branched alkyl group containing from 1 to 6 carbon atoms; R2 and R3, different from one another, are selected between H and OH, and their pharmaceutically acceptable salts.
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