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The purpose of the present study is to find the natural compound(s) having a therapeutic potential to treat lung inflammatory disorders. In our screening procedure, the methanol extract of the seeds of Cassia obtusifolia (cassiae semen) inhibited inducible nitric oxide synthase‐catalyzed nitric oxide production in alveolar macrophages (MH‐S). From the extract, 8 major anthraquinone derivatives were...