On compounds with a one-dalton neighbour, a mass error of this size is genuinely consequential and not merely untidy. This is not one of the ambiguous pairs, but the principle is why the index caps status rather than passing the record.
pt141_one_da
Bremelanotide versus melanotan II. One dalton, twenty-three confirmed mix-ups.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
7
n=7
Annotations
13
n=13
Median purity submitted
98.97%
n=7
Suppliers covered
5
n=7
Section 2
Records submitted
A submitter chose to buy this material and to pay for this assay. That choice is the selection mechanism behind the whole index and it is not random.
| Report | Compound | Supplier | Lot | Lab | Quarter | Purity % | Water % | Recovery % | Provenance | Flags | Result |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AX-2026-042326 | Kisspeptin-10 | TFC | TFC-2604-B2419 | Janoshik | 2026-Q2 | 99.24 | 5.74 | 103.7 | Buyer-sourced | 0 | PASS |
| AX-2026-043254 | Hexarelin | CPC | CPC-2511-F9455 | Janoshik | 2026-Q2 | 98.44 | 5.30 | 98.5 | Buyer-sourced | 0 | FAIL |
| AX-2026-043231 | ARA-290 | SGN | SGN-2605-X9069 | VendorInvestigate | 2026-Q2 | 97.80 | 7.58 | — | Buyer-sourced | 0 | FAIL |
| AX-2026-041750 | Cagrilintide | TFS | TFS-{CAT}-1681 | Janoshik | 2026-Q2 | 99.34 | 4.85 | 91.7 | Buyer-sourced | 0 | PASS |
| AX-2025-020166 | CJC-1295 with DAC | ERP | ERP-2506-E9178 | Kestrel | 2025-Q3 | 98.97 | 4.55 | — | Buyer-sourced | 1 | FAIL |
| AX-2025-020756 | Semaglutide | SGN | SGN-2502-J9369 | Janoshik | 2025-Q2 | 97.81 | 5.22 | 94.3 | Buyer-sourced | 0 | PASS |
| AX-2024-004591 | Melanotan II | TFC | TFC-2401-J9617 | PeptideMeter | 2024-Q2 | 99.42 | 3.55 | — | Buyer-sourced | 0 | PASS |
Section 3
Annotations
Signed technical comments on records. The index does not moderate annotations for agreement with its own arithmetic, and several of these disagree with it. Where a handle has made the same point on several records, one instance is shown and the rest are reachable from the records themselves.
On the one-dalton pairs, retention and mass are both needed and neither alone suffices. This is the class where the rule earns its severity.
On compounds separated by a single dalton this level of accuracy is the whole game. -1.5 ppm excludes the neighbour comfortably.
On compounds separated by a single dalton this level of accuracy is the whole game. -3.6 ppm excludes the neighbour comfortably.
Showing 4 distinct comments of 13 annotations by this handle.