alpha-Kainic acid A, first isolated in 1953 from the marine alga Digenea si
mplex,(1) is the parent member of the kainoids displaying potent anthelmint
ic properties and neurotransmitting activity(2,3) in the central nervous sy
stem. Among these properties, the neuroexcitatory activity is attributed to
their trans C-2/C-3 : cis C-3/C-4 structure and the functionality at the C
-4 center beside the 2-carboxy and 3-carboxymethyl functionalities.