Understand the source comparison
Comparison Table: IUPAC Systematic Naming vs Trivial Names
Oxytocin Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂ with [Cys¹-Cys⁶] disulfide Nonapeptide, cyclic via disulfide, C-terminus amidated Trivial name doesn't reveal the critical disulfide or amidation—both required for activity Use systematic name in synthesis order
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Oxytocin
- Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂ with [Cys¹-Cys⁶] disulfide
- Nonapeptide, cyclic via disulfide, C-terminus amidated
- Trivial name doesn't reveal the critical disulfide or amidation—both required for activity
- Use systematic name in synthesis orders to avoid receiving linear inactive form
- BPC-157
- H-Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val-OH
- Pentadecapeptide, free carboxyl C-terminus, no modifications
- Trivial name gives zero sequence information—synthesis labs need the full 15-residue sequence
- Always confirm full sequence before ordering; "BPC-157" alone is insufficient for synthesis spec
- Melanotan II
- Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH₂
- Heptapeptide, cyclic via lactam bridge [Asp-Lys], acetylated, amidated, contains D-Phe and Nle
- Cyclic structure and D-Phe substitution are invisible in trivial name but critical for receptor selectivity
- Specify full systematic structure including stereochemistry and cyclization points
- Thymosin α1
- 28-residue sequence beginning Ac-Ser-Asp-Ala-Ala-Val…
- Acetylated N-terminus, 28 residues, specific sequence derived from thymopoietin
- Trivial name doesn't specify length or modifications—thymosin family has multiple members
- Use full sequence or at minimum "thymosin alpha-1, 28-residue acetylated form" in orders
- GHRP-6
- His-D-Trp-Ala-Trp-D-Phe-Lys-NH₂
- Hexapeptide, two D-amino acids ([D-Trp²] and [D-Phe⁵]), C-terminus amidated
- D-amino acids confer protease resistance—missing this in nomenclature means receiving the all-L form with 10× shorter half-life
- Systematic notation ([D-Trp²,D-Phe⁵]-GHRP-6) prevents costly all-L synthesis errors