Gepon

1 Identity

Linear synthetic tetradecapeptide, all-L. A Russian-developed immunomodulator. and listed by one seller as "Gepon peptide 10MG vial" and "Gepon peptide 200MG liquid spray".

Sequence

Thr-Glu-Lys-Lys-Arg-Arg-Glu-Thr-Val-Glu-Arg-Glu-Lys-Glu (TEKKRRETVEREKE), 14 residues, free termini.

Molecular formula

C74H132N26O27, as stated on one seller's product specification and by one institutional catalog.

Average mass

1818.025 Da for C74H132N26O27.

Monoisotopic mass

1816.97552 Da monoisotopic neutral; [M+H]+ 1817.98280. Both figures are calculated from a formula stated by suppliers and not from an independent structural determination; a formula from a seller and a formula from a structure determination are not the same evidence, so the masses stand as derived rather than measured values.

Salt / variant note

No close mass collision has been identified in the catalog. The peptide is unusually charge-dense — six basic residues against five acidic — which gives it distinctive chromatographic behavior but also makes it prone to co-eluting with nothing at all on conventional C18, a practical characterization problem rather than an identity one.

2 Class & testing panel

Form

Single article

Testing panel

P1 — panel definition

3 Primary sources & evidence

The index reports the design and provenance of the literature, not a conclusion about effect.

Identity evidence is moderate: a formula stated by one seller and corroborated by one institutional catalog, with masses derived from that formula rather than measured. Regulatory evidence is clear — Russian registration is documented and US approval is absent.

4 Storage & specification

Storage

Not assigned; the article is not offered.

Shelf life

Not assigned; the article is not offered.