B7-33 mass & m/z.

Molecular formula C131H229N41O36S · Secretagogue & Regulatory. Mass and m/z below are computed from the verified molecular formula; the isoelectric point is computed only where the sequence permits.

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Molecular mass

Computed from the verified molecular formula.
Average molecular weight	2986.58 g/mol
Monoisotopic mass	2984.7070 Da

Average mass varies ~0.01–0.1 Da between atomic-weight tables; monoisotopic uses most-abundant-isotope masses.

ESI-MS m/z (positive mode)

Predicted protonated ion series [M+nH]ⁿ⁺, m/z = (M + n·1.007276) / n.
Charge state	m/z (monoisotopic)	m/z (average)
[M+1H]1+	2985.7142	2987.59
[M+2H]2+	1493.3608	1494.30
[M+3H]3+	995.9096	996.53
[M+4H]4+	747.1840	747.65

Isoelectric point (pI)

Not computed

pI is not published for this compound — modified C-terminus (NH2). A residue-pKa pI calculation is only valid for a linear, unmodified peptide of the standard 20 L-amino acids with free termini; computing one here would be a fabricated value.

Method & provenance

Mass: element arithmetic over the verified molecular formula. Monoisotopic uses most-abundant-isotope masses (CODATA/AME); average uses IUPAC 2021 standard atomic weights.
ESI-MS m/z: positive-mode protonated ions [M+nH]ⁿ⁺, m/z = (M + n·1.007276) / n, from the computed monoisotopic (and average) mass.
pI: computed only for linear, unmodified peptides of the standard 20 L-amino acids with free termini; otherwise flagged. Values are analytical/characterization data only — no efficacy, dosing, or human-use meaning.

Related resources

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Analytical reference