abstract "sitaxentan derivative" a compound represented by formula (1-1) or (1-2) or a pharmacologically acceptable salt thereof retains the major beneficial effects of sitaxentan while having an enhanced cyp inhibitory action. where r1 is a halogen atom, etc., r2 is a methyl group, etc., r3 is a C1-6 alkyl group, etc., and m is a group represented by:, etc.
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