Impurities & Reference Standards
API Impurities
Source 1942 api impurities for research, QC and production, documented with COA and SDS.
14,098products
1,516in stock
COA + SDSwith every lot
4,4'-(2,5-Dioxopiperazine-1,4-diyl)dibenzonitrile
- CAS
- 2733025-09-5
- Formula
- C18H12N4O2
- MW
- 316.3 g/mol
VQ-045077
![4,4'-(Carbonyldiimino)bis[benzoic acid] ethyl ester chemical structure](/media/structures/PJNQSLGBJUMCFZ-UHFFFAOYSA-N.svg)
4,4'-(Carbonyldiimino)bis[benzoic acid] ethyl ester
- CAS
- 78015-36-8
- Formula
- C19H20N2O5
- MW
- 356.4 g/mol
VQ-029394
4,4'-(Oxybis(phenylmethylene))bis(chlorobenzene)
- CAS
- 62084-35-9
- Formula
- C26H20Cl2O
- MW
- 419.3 g/mol
VQ-047749
4,4'-(Sulfonylbis(4,1-phenylene))bis(5-methyl-3-phenylisoxazole)
- CAS
- 2338845-31-9
- Formula
- C32H24N2O4S
- MW
- 532.6 g/mol
VQ-044893
![4,4'-[Methylenebis(methylimino)]diantipyrine chemical structure](/media/structures/GEFDLFMKEPTYLA-UHFFFAOYSA-N.svg)
4,4'-Azanediylbis(N-(pyridin-2-yl)benzenesulfonamide)
- CAS
- 2033064-46-7
- Formula
- C22H19N5O4S2
- MW
- 481.6 g/mol
VQ-027162
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