definiens: means ( i ) the ( - ) enantiomer with the chemical name : ( 2R - cis)-4 - amino-5 - fluoro-1-[2-(hydroxymethyl)-1, 3 - oxathiolan-5 - yl]-2(1H)-pyrimidinone ; ( ii ) any mix ture of the enantiomer described in Subsection 1.23(i ) and the ( + ) enantio mer with the chemical name : ( 2S - cis)-4 - amino-5 - fluoro-1-[2-(hydroxymethyl0 - 1, 3 - oxathiolan-5 - yl]-2(1H)-pyrimidinone, in which the ratio of such * * * equal to or greater than * * * to * * * ; or ( iii ) any salts, est ers and N alkylated derivatives of any of the foregoing . FTC is exclusi vely licensed to Triangle by Emory University pursuant to a License Agreement da ted April 17, 1996, as amended on May 6, 1999 ( the ) for use in the prevention and treatment of HIV and HBV throughout the world