definiens: ) . The term shall mean Net Sales 16 < PAGE > of at least U.S.$6 million with respect to the first year following the FirstCommercial Sale in the United Kingdom, U.S.$13.5 million with respect to thesecond year following the First Commercial Sale in the United Kingdom, U.S.$18.5million with respect to the third year following the First Commercial Sale inthe United Kingdom, U.S.$20 million with respect to the fourth year followingthe First Commercial Sale in the United Kingdom and U.S.$22 million with respectto the fifth year following the First Commercial Sale in the United Kingdom, or, if [COMPANY] or any licensee of [COMPANY] commenced commercial sales ( followingregulatory approval ) of an analog of thalidomide ( referred to by Celgenecurrently as an ) at any time prior to such fifth year, U.S.$18.5 millionwith respect to such fifth year