Disclosed herein is compound 1 ##STR00001## or a pharmaceutically acceptable salt, or a prodrug thereof. Compound 1 is useful for treating or preventing a variety of diseases or conditions. Results presented herein also demonstrate that Compound 1 is a prostaglandin D.sub.2 antagonist, and as such is useful in the treatment or prevention of prostaglandin D.sub.2 mediated conditions or diseases.A method comprising administering a prostaglandin D.sub.2 antagonist to a mammal suffering from a disease or condition selected from the group consisting of the gastrointestinal tract disorders or diseases, hyperalgesia, allodynia, abdominal cramping, glaucoma, ocular hypertension, and ocular hypotension is also disclosed herein.Pharmaceutical compositions and products comprising compound 1 are also disclosed.

 
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> Cysteine-containing peptides having antioxidant properties

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