Open Ring Aztreonam

JR-AB1001-01

Variant ofAztreonam USP CRS

Desulfonated / β-lactam ring-opened hydrolysis degradation impurity of Aztreonam (USP Open Ring Aztreonam / EP Impurity A; (2S,3S)-2-(((Z)-1-(2-amino-4-thiazolyl)-2-((1-carboxy-1-methylethoxy)imino)-2-oxoethyl)amino)-3-methyl-3-(sulfoamino)propanoic acid).

Structure & identifiers

2D structure — select to enlarge

Catalogue code

JR-AB1001-01

Category

Antibiotics

CAS number

87500-74-1

Grade

Impurity reference standard

Pharmacopoeia

Ph. Eur.

Molecular formula

C13H19N5O9S2

Molecular weight

453.46 g/mol

Pack sizes

25 mg · 50 mg · 100 mg · 500 mg

Record updated

12 Nov 2026

Chemical name

Open Ring Aztreonam

SMILES

C[C@@H](NS(=O)(=O)O)[C@H](NC(=O)/C(=N\OC(C)(C)C(=O)O)c1csc(N)n1)C(=O)O