The FDA recently posted ViroPharma, Inc.'s scientific supplement to its citizen petition asking FDA to stay approval of generic Vancocin (vancomycin hydrochloride).  Vancocin is ViroPharma's orally administered tricyclic glycopeptide antibiotic derived from Amycolatopsis orientalis that is approved for treatment of colitis caused by susceptible bacteria.  There are no unexpired patents or other exclusivities available for…