Abstract: The present invention provides a peptide represented by the amino acid sequence formula (A): H-X1-X2-X3-X4-Gly-X6-X7-Asp-Gln-R  (A) wherein: each of X1 and X3 independently represents Arg or Lys, each of X2, X4 and X6 independently represents Ile or Leu, and X7 represents Phe, Tyr or Trp; and R represents -NH2, -Leu-NH2, -Leu-Ser-NH2, -Leu-Ser-Lys-NH2, -Leu-Ser-Arg-NH2, -Leu-Ser-Lys-Leu-NH2, or -Leu-Ser-Arg-Leu-NH2; and a salt thereof. (In the above, Gly stands for a glycine residue, Asp stands for an aspartic acid residue, Gln stands for a glutamine residue, Arg stands for an arginine residue, Lys stands for a lysine residue, Ile stands for an isoleucine residue, Leu stands for a leucine residue, Phe stands for a phenylalanine residue, Tyr stands for a tyrosine residue, Trp stands for a tryptophan residue, and Ser stands for a serine residue.) The peptide acts on glutamate receptors and is expected to be useful in the treatment of cerebral nerve diseases associated with glutamic acid.

Abstract: A compound having glutamate receptor inhibitor activity represented by the formula: ##STR1## where R represents a hydrogen atom or a group of the formula: ##STR2## m and n each represents an integer of 3 or 4 and p represents an integer of 0 or 1, or a salt thereof is provided. The compounds are useful for an insecticide.

Abstract: A compound of the formula ##STR1## wherein R' is hydrogen atom or an alkyl group, m is an integer of 1 to 3, p is 1 or 2, x is an integer of 2 to 6, and y is an integer of 1 to 3, or a salt thereof, which has glutamate receptor inhibitor activity, a process for preparing the same and an insecticidal composition containing the same are provided.

Abstract: A novel glutamate receptor inhibitor obtained from Joro spider venom glands, and its manufacturing method.