 Gbogbo awon wonyi ni L-stereoisomers (isomer "lapa-osi"), botilejepe awon D-amino acid ("alapa-otun") die wa  ninu eya idaabobo ara bacteria, won le je neuromodulator (D-serine), won tun wa ninu awon egbogi kankan.. 
Awon obi e ni  Anna Maria Jensen (1854-1896) ati Peder Matthias Olsen (1849-1896) ti ilu  FarSunsun, Norway.. 