; (2) the date on which such drug is approved under section 505 of such Act ( 21 U.S.C. 355 ) or licensed under section 351 of the Public Health Service Act ( 42 U.S.C. 262 ) or becomes the subject of an application for such approval or licensure; and (3) the date on which such drug is granted exclusive approval or licensure under section 527 of the Federal Food, Drug, and Cosmetic Act ( 21 U.S.C. 360cc ) or becomes the subject of a request for such exclusive approval or licensure.