Skip to content

Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

14,252products

1,516in stock

COA + SDSwith every lot

Reference Standard

α-Dihydroartemisinin chemical structure

α-Dihydroartemisinin

CAS: 81496-81-3
Formula: C₁₅H₂₄O₅
MW: 284.35 g/mol

VQ-029221

Reference Standard

α-Ethyl Norepinephrine Hydrochloride chemical structure

α-Ethyl Norepinephrine Hydrochloride

CAS: 3198-07-0
Formula: C₁₀H₁₆ClNO₃
MW: 233.69 g/mol

VQ-038686

Reference Standard

α-Ethyl-3,4-dimethoxy-Benzeneacetonitrile chemical structure

α-Ethyl-3,4-dimethoxy-Benzeneacetonitrile

CAS: 39066-05-2
Formula: C₁₂H₁₅NO₂
MW: 205.25 g/mol

VQ-034587

Reference Standard

α-Formyl-(3-endo)-8-methyl-8-azabicyclo[3.2.1]oct-3-yl benzeneacetic Acidester chemical structure

α-Formyl-(3-endo)-8-methyl-8-azabicyclo[3.2.1]oct-3-yl benzeneacetic Acidester

CAS: 22226-37-5
Formula: C₁₇H₂₁NO₃
MW: 287.35 g/mol

VQ-026090

Reference Standard

α-Phenyl-α-(2-propyn-1-yloxy)benzeneacetic Acid chemical structure

α-Phenyl-α-(2-propyn-1-yloxy)benzeneacetic Acid

CAS: 2766-01-0
Formula: C₁₇H₁₄O₃
MW: 266.29 g/mol

VQ-034460

Reference Standard

α-Pyrrolidinopropiophenone Hydrochloride chemical structure

α-Pyrrolidinopropiophenone Hydrochloride

CAS: 19134-50-0
Formula: C₁₃H₁₇NO
MW: 203.28 g/mol

VQ-050076

Reference Standard

α,α-Diisopropylhomoveratronitrile chemical structure

α,α-Diisopropylhomoveratronitrile

CAS: 51698-54-5
Formula: C₁₆H₂₃NO₂
MW: 261.36 g/mol

VQ-028680

Reference Standard

α,α-Diphenyl-γ-butyrolactone chemical structure

α,α-Diphenyl-γ-butyrolactone

CAS: 956-89-8
Formula: C₁₆H₁₄O₂
MW: 238.28 g/mol

VQ-048926

Reference Standard

α,α,α',5-Tetramethyl-1,3-benzenediacetonitrile chemical structure

α,α,α',5-Tetramethyl-1,3-benzenediacetonitrile

CAS: 120512-38-1
Formula: C₁₄H₁₆N₂
MW: 212.29 g/mol

VQ-035737

Reference Standard

β-Apo-8-carotenal chemical structure

β-Apo-8-carotenal

CAS: 1107-26-2
Formula: C₃₀H₄₀O
MW: 416.6 g/mol

VQ-032532

Reference Standard

β-Cholestanol chemical structure

CAS: 80-97-7
Formula: C₂₇H₄₈O
MW: 388.7 g/mol

VQ-024953

Reference Standard

β-Estradiol 17-Acetate chemical structure

β-Estradiol 17-Acetate

CAS: 1743-60-8
Formula: C₂₀H₂₆O₃
MW: 314.4 g/mol

VQ-030595

Reference Standard

β-Lumi (-)-Colchicine chemical structure

β-Lumi (-)-Colchicine

CAS: 6901-13-9
Formula: C₂₂H₂₅NO₆
MW: 399.4 g/mol

VQ-022256

Reference Standard

β-Pinene chemical structure

CAS: 127-91-3
Formula: C₁₀H₁₆
MW: 136.23 g/mol

VQ-036101

Reference Standard

β-Tocopherol (Racemic Mixture) chemical structure

β-Tocopherol (Racemic Mixture)

CAS: 148-03-8
Formula: C₂₈H₄₈O₂
MW: 416.7 g/mol

VQ-042927

Reference Standard

Γ-Terpinene chemical structure

CAS: 99-85-4
Formula: C₁₀H₁₆
MW: 136.23 g/mol

VQ-034144

Reference Standard

Δ-4,6-Betamethasone

Δ-4,6-Betamethasone

CAS: 2317-44-4
Formula: C₂₂H₂₇FO₅
MW: 390.5 g/mol

VQ-035335

Reference Standard

δ-8(9)-Dehydroestrone Sodium Sulfate chemical structure

δ-8(9)-Dehydroestrone Sodium Sulfate

CAS: 61612-83-7
Formula: C₁₈H₁₉NaO₅S
MW: 370.4 g/mol

VQ-037100

Reference Standard

Δ5,24-Stigmastadienol chemical structure

Δ5,24-Stigmastadienol

CAS: 28949-66-8
Formula: C₂₉H₄₈O
MW: 412.7 g/mol

VQ-033945

Reference Standard

Δ9(11)-Estradiol 17-Hexanoate chemical structure

Δ9(11)-Estradiol 17-Hexanoate

CAS: 95960-05-7
Formula: C₂₅H₃₄O₃
MW: 382.5 g/mol

VQ-030594

Need a price, a spec or a custom compound?

Send us your list — product names or CAS numbers, grade, quantity and destination. Our team replies with a formal quotation, COA and lead time.

Request a quote Contact sales