definiens: means ( a ) the ( - ) enantiomer wit h the chemical name ( 2R - cis ) -4 - amino-5 - fluoro-1-[2-(hydroxymethyl)-1,3 - oxathiol an-5 - yl]-2(1H)-pyrimidinone ; ( b ) any mixture of the ( - ) enantiomer described in Subsection 1.13(a ) and the ( + ) enantiomer with the chemical name ( 2S - cis)-4 - am ino-5 - fluoro-1-[2- ( hydroxymethyl)-1,3 - oxathiolan-5 - yl]-2(1H)-pyrimidi none, * * * ; ( c ) any salts, esters ( including, but not limited to, all 5 ' phosphate esters ) and N alkylated derivatives of an y of the foregoing ; or ( d ) any and all polymorphs, hydrates and solvates of an y of the foregoing . FTC is exclusively licensed to Triangle by Emory Universit y pursuant to a License Agreement dated April 17, 1996, as amended on May 6, 1999 and on July 10, 2000 ( the ) for use in the prevention and treatment of HIV and HBV throughout the world