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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Quinazoline, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Quinazoline impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Quinazoline-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Quinazoline Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Methyl 8-fluoro-3,4-dihydro-2-[4-[3-(methoxy-d3)phenyl]-1-pi... Stable Isotopes CS-O-48629 1961287-80-8 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-(1-Ethyl-1H-pyrazol-4-yl)[1,2,4]triazolo[1,5-c]quinazoline Impurity CS-O-57102 1005691-67-7 Enquire
2-(1-Methyl-1H-pyrazol-4-yl)[1,2,4]triazolo[1,5-c]quinazolin... Impurity CS-O-57100 1005643-71-9 Enquire
2-(1-Methyl-1H-pyrazol-5-yl)[1,2,4]triazolo[1,5-c]quinazolin... Impurity CS-O-57112 1005692-07-8 Enquire
2-[1-[(4-Chlorophenoxy)methyl]-1H-pyrazol-5-yl][1,2,4]triazo... Impurity CS-O-57099 1005562-82-2 Enquire
4-Amino-6,7dimethoxy-2-(1-piperazinyl)quinazoline dihydrochl... Impurity CS-O-55062 ---- Enquire
9-Fluoro-2-(3-pyridinyl)[1,2,4]triazolo[1,5-c]quinazoline Impurity CS-O-57101 1324056-91-8 Enquire
9-Fluoro-2-(4-pyridinyl)[1,2,4]triazolo[1,5-c]quinazoline Impurity CS-O-57098 1324059-08-6 Enquire
Linagliptin Chloroquinazoline impurity Impurity CS-O-47202 2638512-67-9 Enquire
N6-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)quinazoline-4,6-diam... Impurity CS-O-44117 Not Available Enquire
Repaglinide Quinazoline Impuriy A Impurity CS-O-46913 Not Available Enquire
Repaglinide Quinazoline Impuriy B Impurity CS-O-46914 Not Available Enquire
Rosuvastatin Dihydrobenzoquinazoline (3R,5R,6RS)-Isomer Impurity CS-O-56157 Not Available In Stock
Rosuvastatin Dihydrobenzoquinazoline (6S)-Isomer Impurity CS-O-38626 854898-53-6 In Stock
2-Chloromethyl-3-oxo-4-methyl quinazoline Impurity CS-O-40456 6640-59-1 Enquire
4-Chloro-6-hydroxy-7-methoxyquinazoline Impurity CS-M-51712 574745-97-4 Enquire
4-Chloro-7-(2-chloroethoxy)-6-(2-methoxyethoxy)quinazoline Impurity CS-T-11327 183322-20-5 Enquire
6,7-Dimethoxy-N2,N2-dimethylquinazoline-2,4-diamine Impurity CS-T-91040 19216-53-6 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(S)-N4-(3-Chloro-4-fluorophenyl)-7-((tetrahydrofuran-3-yl)ox... Intermediate CS-O-13076 314771-76-1 In Stock
2-(chloromethyl)-4-methylquinazoline Intermediate CS-O-31217 109113-72-6 In Stock
4-chloro-2-(4-chlorophenyl)-6,7,8-trimethoxyquinazoline Intermediate CS-O-55431 228118-54-5 Enquire
4-chloro-6,7,8-trimethoxy-2-(4-methoxyphenyl)quinazoline Intermediate CS-O-55430 71694-84-3 Enquire
4-chloro-6,7,8-trimethoxy-2-(pyridin-3-yl)quinazoline Intermediate CS-O-55428 1623478-63-6 Enquire
4-chloro-6,7,8-trimethoxy-2-phenylquinazoline Intermediate CS-O-55427 52515-82-9 Enquire
Methyl 8-fluoro-3,4-dihydro-2-[4-(3-methoxyphenyl)-1-piperaz... Intermediate CS-O-48636 791117-40-3 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Methylquinazoline Fine Chemicals CS-ED-42030 700-79-8 Enquire
4-Chloroquinazoline-6,7-diol Fine Chemicals CS-O-54452 1145671-36-8 Enquire
6,7-Dimethoxyquinazoline Fine Chemicals CS-O-54453 4101-33-1 Enquire
4-Chloro-6-(trifluoromethyl)quinazoline Fine Chemicals CS-MM-26859 16499-64-2 Enquire
6-chloro-4-(2-chlorophenyl)-2-quinazoline-2-carboxylic acid Fine Chemicals CS-O-38335 54643-79-7 Enquire
6-nitroquinazoline Fine Chemicals CS-ED-01466 7556-95-8 Enquire


Therapeutic

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-Chloro-6,7-Bis-(2-methoxyethoxy)-4(3H)-quinazoline Therapeutic CS-O-31360 183322-18-1 In Stock