Identify the substance described by the record before interpreting its analytical numbers.
A short name may cover different chemical forms
The FDA TB-500 briefing describes an N-terminally acetylated seven-residue fragment and notes that the common name has been used for different salts or derivatives. Its BPC-157 briefing discusses a fifteen-residue peptide and distinguishes free-base and acetate forms. A matching short name alone therefore does not establish a matching chemical form.
Separate reference identity from sample measurements
Sequence, terminal modifications and salt form describe identity. Spectra, chromatograms and report identifiers describe an individual sample and its testing. Reference mass and measured mass need a common chemical and measurement basis. A value from a publication should not be presented as a result measured on an unrelated batch.
Use a traceable reading order
A useful review order is full name, chemical form, reference basis, sample identifier and analytical report. When two records show different masses, first compare their forms, modifications and definitions. Retain the underlying records so that a discrepancy remains explainable.
Original sources
These notes explain public references; they do not replace sample-specific testing or case-specific professional judgment.