LY 354740 [ 2-aminobicyclo(3.1.0)hexane-2,6-dicarboxylic acid,LY 314582,LY 366563,LY-314582,LY-354740,LY-366563,LY314582,LY354740,LY366563 ] LY-354740 is the active isomer, LY-366563 is the inactive isomer, and LY 314582 is the racemate; structure given in first source