CAS Number: 170713-75-4 Molecular Weight: 1807.98 Salt Form: TFA Purity: >96% Sequence (3-letter): Phe-Gly-Gly-Phe-Thr-Gly-Ala-Arg-Lys-Ser-Ala-Arg-Lys-Leu-Ala-Asn-Gln-OH Sequence (1-letter): FGGFTGARKSARKLANQ-OH Storage: -20 ?C or below Nociceptin/orphanin FQ (N/OFQ) is a 17-amino acid neuropeptide and an endogenous ligand for the nociceptin receptor (NOP, ORL-1).