In the case of a drug described in subsection (a)(1) of this section that is not the subject of an application approved under section
355 of this title or section
357 of this title (as in effect on the day before November 21, 1997) or a final regulation promulgated by the Secretary establishing conditions under which the drug is generally recognized as safe and effective and not misbranded, subsection (a) of this section shall apply only with respect to a requirement of a State or political subdivision of a State that relates to the same subject as, but is different from or in addition to, or that is otherwise not identical with—