Exhibit 99.1 AMENDMENT AGREEMENT ------------------- This Amendment Agreement ("Amendment Agreement") is made and entered into as of the 19th of May 2004, between Sanofi-Synthelabo, a French societe anonyme ("Sanofi-Synthelabo") and Aventis, a French...Amendment Agreement • May 21st, 2004 • Sanofi Synthelabo Sa • Pharmaceutical preparations
