DuP - 697 was a building - block for synthesis of COX - 2 inhibitors .
DuP - 697 served as the basic chemical model for the coxibs that are the only selective COX - 2 inhibitors on the market today .
DuP - 697 was a building - block for synthesis of COX - 2 inhibitors and served as the basic chemical model for the coxibs that are the only selective COX - 2 inhibitors on the market today .