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pGlu-Val-Tyr-Val-Val-Ala-Glu-Asn-Gln-Gln-Gly-Lys-Ser-Lys-Ala is a derivative of FGL, a peptide known for its cognitive benefits. In this derivative, the first amino acid, glutamate (Glu), in the original FGL sequence forms a cyclic structure known as pyroglutamate (pGlu). This modification is thought to enhance the peptide's stability and potentially its biological activity. The sequence alteration aims to retain or improve the therapeutic effects associated with FGL, such as enhancing memory function and rescuing cognitive impairments.