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複素環(huán)式化合物

複素環(huán)式化合物は炭素原子と非炭素原子により構(gòu)成される環(huán)狀構(gòu)造の化合物である。これらの非炭素原子はヘテロ原子と総稱(chēng)され,一般的なヘテロ原子は窒素、酸素、硫黃等である。前述したラクトン、ラクタム、環(huán)狀エーテル等の化合物はいずれも複素環(huán)式化合物であり,しかしこれらの化合物の性質(zhì)は同じ種類(lèi)の鎖式化合物と類(lèi)似するため,いずれも対応する章節(jié)に組み込んで説明する。本章は主に環(huán)構(gòu)造が穏やかで、ある程度の芳香族性を有する複素環(huán)式化合物,即ち芳香族複素環(huán)式化合物を説明する。 複素環(huán)式化合物は種類(lèi)が膨大であり,數(shù)量が多く,自然界に広く分布しており,多くの天然の複素環(huán)式化合物は動(dòng)物、植物の體內(nèi)で重要な生理學(xué)的作用を果たす。例えば:植物內(nèi)のクロロフィル、動(dòng)物の血中ヘモグロビン、漢方薬中の有効成分のアルカロイドと一部の配糖體、一部の抗生物質(zhì)とビタミン、タンパク質(zhì)のあるアミノ酸とヌクレオチドを構(gòu)成する塩基等はいずれも複素環(huán)構(gòu)造を含有する。従來(lái)の薬物中で、複素環(huán)構(gòu)造を含有するものは約半分を占める。そのため,複素環(huán)式化合物は有機(jī)化合物(特に有機(jī)薬物)中で重要な地位を占める。 複素環(huán)式化合物中で五員、六員複素環(huán)及びそれらの縮合複素環(huán)化合物は最も普及しており,かつ最も重要である。そのため環(huán)のサイズによって,複素環(huán)式化合物は五員複素環(huán)及び六員複素環(huán)という二つの種類(lèi)に分けられる。例えば上記フラン、チオフェン、ピロール、オキサゾール、イミダゾール及びそれらの縮合複素環(huán)化合物のインドール、ベンゾイミダゾール、ジベンゾフラン等はいずれも五員複素環(huán)式化合物であり,それに対してピリジン、ピリミジン及びそれらの縮合複素環(huán)化合物のキノリン、キナゾリン等はいずれも六員複素環(huán)式化合物である。 各五員複素環(huán)式化合物と六員複素環(huán)式化合物中で,環(huán)構(gòu)造中のヘテロ原子の數(shù)量によって,また一つのヘテロ原子を含有する複素環(huán)及び二つ又はそれ以上のヘテロ原子を含有する複素環(huán)に分けられる。例えばフラン、チオフェン、ピリジン、インドール、キノリン、ジベンゾフラン等は一つのヘテロ原子を含有する複素環(huán)式化合物である;イミダゾール、ピリミジン、ベンゾイミダゾール、キナゾリン等は二つのヘテロ原子を含有する複素環(huán)式化合物である;それに対してプリンは二つ以上のヘテロ原子を含有するため,即ち複數(shù)のヘテロ原子を含有する複素環(huán)式化合物である。分子中の環(huán)構(gòu)造の形式によって,複素環(huán)式化合物はさらに複素単環(huán)及び縮合複素環(huán)という二つの種類(lèi)に分けられる。例えばフラン、ピリジン、ピリミジン、イミダゾール等はいずれも複素単環(huán)式化合物であり,インドール、キノリン、ジベンゾフラン、プリン等は縮合複素環(huán)式化合物である。
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Structure Chemical Name CAS MF
2-Chloro-4-(2-methoxyphenyl)-6-methoxy-1,3,5-triazine 2-Chloro-4-(2-methoxyphenyl)-6-methoxy-1,3,5-triazine 1303967-78-3 C11H10ClN3O2
4-Bromo-2-chloro-6-(iso-butyl-d9)-pyridine 4-Bromo-2-chloro-6-(iso-butyl-d9)-pyridine 1643564-13-9 C9H11BrClN
Thiazole, 4-bromo-2-[(tetrahydro-2-furanyl)methoxy]- Thiazole, 4-bromo-2-[(tetrahydro-2-furanyl)methoxy]- 1520844-96-5 C8H10BrNO2S
4-Bromo-5-methyl-2-(diethylamino)thiazole 4-Bromo-5-methyl-2-(diethylamino)thiazole 1643542-22-6 C8H13BrN2S
4-Amino-3,5-dibromo-2-(4-methylpiperidin-1-yl)pyridine 4-Amino-3,5-dibromo-2-(4-methylpiperidin-1-yl)pyridine 1563528-80-2 C11H15Br2N3
4-Bromo-2-ethylpyridine-d8 4-Bromo-2-ethylpyridine-d8 1643563-41-0 C7BrD8N
Pyridine, 2-bromo-6-(1,1-dimethylethyl)-4-fluoro- Pyridine, 2-bromo-6-(1,1-dimethylethyl)-4-fluoro- 2645417-16-7 C9H11BrFN
4-Bromo-3-(5-pyrimidyl)pyridine 4-Bromo-3-(5-pyrimidyl)pyridine 1374665-56-1 C9H6BrN3
4-Amino-3,5-dibromo-2-(cyclobutyl)pyridine 4-Amino-3,5-dibromo-2-(cyclobutyl)pyridine 1563534-08-6 C9H10Br2N2
4-Bromo-2-fluoro-6-(methyl-d3)-pyridine 4-Bromo-2-fluoro-6-(methyl-d3)-pyridine 1643563-00-1 C6H5BrFN
2-Bromo-5-(tert-butyl)pyridine-d12 2-Bromo-5-(tert-butyl)pyridine-d12 1643562-91-7 C9H12BrN
4-Amino-3,5-dibromo-2-(pyrrolidino)pyridine 4-Amino-3,5-dibromo-2-(pyrrolidino)pyridine 1563529-45-2 C9H11Br2N3
2,2'-Bipyridine, 6'-bromo-4-chloro- 2,2'-Bipyridine, 6'-bromo-4-chloro- 1185306-09-5 C10H6BrClN2
4-Amino-3,5-dibromo-2,2'-bipyridine 4-Amino-3,5-dibromo-2,2'-bipyridine 1563534-90-6 C10H7Br2N3
2-Chloro-4-(3-fluorophenyl)-6-hydroxy-1,3,5-triazine 2-Chloro-4-(3-fluorophenyl)-6-hydroxy-1,3,5-triazine 1303967-48-7 C9H5ClFN3O
[2,2'-Bipyridine]-5-carbonitrile, 5'-bromo- [2,2'-Bipyridine]-5-carbonitrile, 5'-bromo- 1185306-20-0 C11H6BrN3
4-Bromo-3-amino-6-(2-methylimidazol-1-yl)pyridine 4-Bromo-3-amino-6-(2-methylimidazol-1-yl)pyridine 1381941-46-3 C9H9BrN4
4-Bromo-6-(methoxy-d3)-pyrimidine 4-Bromo-6-(methoxy-d3)-pyrimidine 1185318-17-5 C5H5BrN2O
4-Bromo-3-amino-6-(4-methoxyphenyl)pyridine 4-Bromo-3-amino-6-(4-methoxyphenyl)pyridine 1381938-62-0 C12H11BrN2O
4-Bromo-3-amino-6-(n-propyl)pyridine 4-Bromo-3-amino-6-(n-propyl)pyridine 1381934-24-2 C8H11BrN2
4-Bromo-3-amino-6-ethylpyridine 4-Bromo-3-amino-6-ethylpyridine 1381935-22-3 C7H9BrN2
4-Bromo-5-(n-propyl)pyrimidine 4-Bromo-5-(n-propyl)pyrimidine 1563534-31-5 C7H9BrN2
(2-(thiazol-5-yl)pyridin-4-yl)boronic acid (2-(thiazol-5-yl)pyridin-4-yl)boronic acid 2225155-00-8 C8H7BN2O2S
2-(2-fluorophenyl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(2-fluorophenyl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1402172-79-5 C17H19BFNO2
2'-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,4'-bipyridine 2'-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,4'-bipyridine 2223043-21-6 C16H19BN2O2
2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6-(3-(trifluoromethyl)phenyl)pyridine 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6-(3-(trifluoromethyl)phenyl)pyridine 1402233-62-8 C18H19BF3NO2
2-(tetrahydrofuran-3-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(tetrahydrofuran-3-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2222996-27-0 C15H22BNO3
2-cyclopentyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-cyclopentyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2223037-41-8 C16H24BNO2
4-(1H-pyrazol-1-yl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 4-(1H-pyrazol-1-yl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2223050-94-8 C14H18BN3O2
Pyridine, 2-bromo-4-fluoro-6-methoxy- Pyridine, 2-bromo-4-fluoro-6-methoxy- 1805553-81-4 C6H5BrFNO
2-Bromo-6-(ethyl-d5)-pyridine 2-Bromo-6-(ethyl-d5)-pyridine 1185313-44-3 C7H8BrN
2-Bromo-6-(tert-butoxy-d9)-pyridine 2-Bromo-6-(tert-butoxy-d9)-pyridine 1185314-70-8 C9H12BrNO
6-(1H-Pyridin-2-one)-2-bromopyridine 6-(1H-Pyridin-2-one)-2-bromopyridine 959237-86-6 C10H7BrN2O
Pyridine-3-d, 2-bromo- (9CI) Pyridine-3-d, 2-bromo- (9CI) 54267-61-7 C5H4BrN
4-Chloro-2-amino-6-(n-propyl-d7)-pyrimidine 4-Chloro-2-amino-6-(n-propyl-d7)-pyrimidine 1185315-12-1 C7H3ClD7N3
4-Chloro-5-cyano-2-(iso-propyl-d7)-pyrimidine 4-Chloro-5-cyano-2-(iso-propyl-d7)-pyrimidine 1185309-78-7 C8H8ClN3
4-Chloro-5-trifluoromethyl-2-(iso-propyl-d7)-pyrimidine 4-Chloro-5-trifluoromethyl-2-(iso-propyl-d7)-pyrimidine 1185312-06-4 C8H8ClF3N2
4-Chloro-6-(methyl-d3)-pyrimidine 4-Chloro-6-(methyl-d3)-pyrimidine 1185318-23-3 C5H5ClN2
5-(Ethyl-d5)-pyridine-2-boronic acid pinacol ester 5-(Ethyl-d5)-pyridine-2-boronic acid pinacol ester 2223045-83-6 C13H20BNO2
5-(iso-Propyl-d7)-pyridine-2-boronic acid pinacol ester 5-(iso-Propyl-d7)-pyridine-2-boronic acid pinacol ester 2223052-37-5 C14H22BNO2
5-(Pyrrolidinopyridine-d11)-2-boronic acid pinacol ester 5-(Pyrrolidinopyridine-d11)-2-boronic acid pinacol ester 2223032-41-3 C15H23BN2O2
4-Amino-3-bromo-2-(diethylamino)pyridine 4-Amino-3-bromo-2-(diethylamino)pyridine 1563534-04-2 C9H14BrN3
4-Amino-3-bromo-6-(3-cyanophenyl)pyridine 4-Amino-3-bromo-6-(3-cyanophenyl)pyridine 1563532-46-6 C12H8BrN3
4-Amino-3-bromo-6-(cyclobutoxy)pyridine 4-Amino-3-bromo-6-(cyclobutoxy)pyridine 1446406-92-3 C9H11BrN2O
4-Amino-5-bromo-2-(pyrazin-2-yl)pyrimidine 4-Amino-5-bromo-2-(pyrazin-2-yl)pyrimidine 1541460-30-3 C8H6BrN5
[2-Methyl-5-(n-propyl)-d10]-pyridine-3-boronic acid [2-Methyl-5-(n-propyl)-d10]-pyridine-3-boronic acid 2225179-40-6 C9H14BNO2
[4-Methyl-5-(sec-butyl)-d12]-pyridine-3-boronic acid [4-Methyl-5-(sec-butyl)-d12]-pyridine-3-boronic acid 2225152-30-5 C10H16BNO2
[4-Methyl-6-(sec-butyl)-d12]-pyridine-3-boronic acid [4-Methyl-6-(sec-butyl)-d12]-pyridine-3-boronic acid 2225151-65-3 C10H16BNO2
4-Bromo-6-cyclobutoxypyrimidine 4-Bromo-6-cyclobutoxypyrimidine 1353856-99-1 C8H9BrN2O
4-CHLORO-2-(2-METHYLPIPERIDIN-1-YL)PYRIMIDINE 4-CHLORO-2-(2-METHYLPIPERIDIN-1-YL)PYRIMIDINE 1434128-04-7 C10H14ClN3
2-Chloro-4-(3-methoxyphenyl)-6-methoxy-1,3,5-triazine 2-Chloro-4-(3-methoxyphenyl)-6-methoxy-1,3,5-triazine 1303967-38-5 C11H10ClN3O2
2-Chloro-4-(4-methoxyphenyl)-6-methoxy-1,3,5-triazine 2-Chloro-4-(4-methoxyphenyl)-6-methoxy-1,3,5-triazine 1303967-73-8 C11H10ClN3O2
2-Chloro-4-(4-tolyl)-6-hydroxy-1,3,5-triazine 2-Chloro-4-(4-tolyl)-6-hydroxy-1,3,5-triazine 1303967-50-1 C10H8ClN3O
2-Chloro-4-amino-3-(2-fluorophenyl)pyridine 2-Chloro-4-amino-3-(2-fluorophenyl)pyridine 1381942-64-8 C11H8ClFN2
4-bromo-5-fluoro-2-(methoxy-d3)pyridine-3,6-d2 4-bromo-5-fluoro-2-(methoxy-d3)pyridine-3,6-d2 2294950-53-9 C6BrD5FNO
4-Bromo-6-(2-methoxyphenyl)pyrimidine 4-Bromo-6-(2-methoxyphenyl)pyrimidine 1260803-73-3 C11H9BrN2O
4-Bromo-6-(3-trifluoromethylphenyl)pyrimidine 4-Bromo-6-(3-trifluoromethylphenyl)pyrimidine 1142194-05-5 C11H6BrF3N2
4-bromopyrimidin-5,6-d2-2-amine 4-bromopyrimidin-5,6-d2-2-amine 2241865-57-4 C4H4BrN3
4-Chloro-2-(pyrrolidin-3-yl)pyrimidine 4-Chloro-2-(pyrrolidin-3-yl)pyrimidine 1159821-03-0 C8H10ClN3
4-(2-chlorophenyl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 4-(2-chlorophenyl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2223035-78-5 C17H19BClNO2
4-(4-methyl-1H-pyrazol-1-yl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 4-(4-methyl-1H-pyrazol-1-yl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1402240-23-6 C15H20BN3O2
4-(cyclohexyloxy)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 4-(cyclohexyloxy)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1402174-16-6 C17H26BNO3
4-cyclohexyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 4-cyclohexyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1402240-77-0 C17H26BNO2
4-isobutyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 4-isobutyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2223053-41-4 C15H24BNO2
5-(3-methylpiperidin-1-yl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 5-(3-methylpiperidin-1-yl)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1402174-01-9 C17H27BN2O2
5-(6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)pyrimidine 5-(6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)pyrimidine 2223036-40-4 C15H18BN3O2
5-cyclobutoxy-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 5-cyclobutoxy-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2223045-27-8 C15H22BNO3
N,N-diethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-4-amine N,N-diethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-4-amine 1416063-41-6 C15H25BN2O2
Pyridine, 3-cyclopropyl-5-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]- Pyridine, 3-cyclopropyl-5-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]- 1402226-81-6 C17H22BN3O2
2-Chloro-3-cyano-6-(ethyl-d5)-pyridine 2-Chloro-3-cyano-6-(ethyl-d5)-pyridine 1185314-72-0 C8H2ClD5N2
2-Chloro-3-trifluoromethyl-6-(iso-propyl-d7)-pyridine 2-Chloro-3-trifluoromethyl-6-(iso-propyl-d7)-pyridine 1185316-54-4 C9H2ClD7F3N
2-Chloro-5-(acetyl-d3)-pyridine 2-Chloro-5-(acetyl-d3)-pyridine 1185314-86-6 C7H6ClNO
2-Cyano-6-(iso-butyl-d9)-pyridine-4-boronic acid 2-Cyano-6-(iso-butyl-d9)-pyridine-4-boronic acid 2225174-89-8 C10H13BN2O2
2-Fluoro-6-(n-propyl-d7)-pyridine-4-boronic acid 2-Fluoro-6-(n-propyl-d7)-pyridine-4-boronic acid 2225169-56-0 C8H11BFNO2
3,6-Dibromopyridazine-d2 3,6-Dibromopyridazine-d2 1643543-37-6 C4H2Br2N2
5-[(iso-Propyl)pyridine-d10]-2-boronic acid pinacol ester 5-[(iso-Propyl)pyridine-d10]-2-boronic acid pinacol ester 2223038-83-1 C14H22BNO2
5-Bromo-2-(methyl-d3)-pyrimidine 5-Bromo-2-(methyl-d3)-pyrimidine 1185316-89-5 C5H5BrN2
5-Bromo-2-(sec-butyl-d9)-pyrimidine 5-Bromo-2-(sec-butyl-d9)-pyrimidine 1643577-54-1 C8H2BrD9N2
5-Bromo-4-(ethyl-d5)-pyrimidine 5-Bromo-4-(ethyl-d5)-pyrimidine 1643539-15-4 C6H7BrN2
4-Amino-6-(2-pyridyl)-2-cyclopropylpyrimidine 4-Amino-6-(2-pyridyl)-2-cyclopropylpyrimidine 1159820-21-9 C12H12N4
4-Amino-6-(2-trifluoromethylphenyl)pyrimidine 4-Amino-6-(2-trifluoromethylphenyl)pyrimidine 1215072-88-0 C11H8F3N3
[6-Methyl-5-(tert-butyl)-d12]-pyridine-3-boronic acid [6-Methyl-5-(tert-butyl)-d12]-pyridine-3-boronic acid 2225170-83-0 C10H16BNO2
2-(2-HYDROXYPROPAN-2-YL-d6)-PYRIDINE-4-BORONIC ACID 2-(2-HYDROXYPROPAN-2-YL-d6)-PYRIDINE-4-BORONIC ACID 2225169-85-5 C8H12BNO3
2-(n-Propyl-d7)-6-trifluoromethylpyridine-4-boronic acid 2-(n-Propyl-d7)-6-trifluoromethylpyridine-4-boronic acid 2225170-66-9 C9H11BF3NO2
2-(sec-Butyl-d9)-6-fluoropyridine-4-boronic acid 2-(sec-Butyl-d9)-6-fluoropyridine-4-boronic acid 2225152-00-9 C9H4BD9FNO2
2,4-Dichloro-6-(methyl-d3)-pyridine 2,4-Dichloro-6-(methyl-d3)-pyridine 1185312-83-7 C6H5Cl2N
2-[(iso-Butyl)pyridine-d12]-4-boronic acid 2-[(iso-Butyl)pyridine-d12]-4-boronic acid 2225174-72-9 C9H14BNO2
4-Chloro-2-(tetrahydropyran-3-yl)pyrimidine 4-Chloro-2-(tetrahydropyran-3-yl)pyrimidine 1159814-22-8 C9H11ClN2O
4-Chloro-2-hydroxy-5-(n-propyl)pyrimidine 4-Chloro-2-hydroxy-5-(n-propyl)pyrimidine 1563531-15-6 C7H9ClN2O
4-Chloro-2-phenyl-6-(2-pyridyl)pyrimidine 4-Chloro-2-phenyl-6-(2-pyridyl)pyrimidine 350490-71-0 C15H10ClN3
4-Chloro-2-phenyl-6-(5-thiazolyl)pyrimidine 4-Chloro-2-phenyl-6-(5-thiazolyl)pyrimidine 1159814-69-3 C13H8ClN3S
4-Chloro-3-(tetrahydrofuran-3-yloxy)pyridine 4-Chloro-3-(tetrahydrofuran-3-yloxy)pyridine 1563534-94-0 C9H10ClNO2
2-CHLORO-4-AMINO-3-(3-TRIFLUOROMETHYLPHENYL)PYRIDINE 2-CHLORO-4-AMINO-3-(3-TRIFLUOROMETHYLPHENYL)PYRIDINE 1381936-91-9 C12H8ClF3N2
2-Chloro-4-amino-3-(4-methoxyphenyl)pyridine 2-Chloro-4-amino-3-(4-methoxyphenyl)pyridine 1381936-17-9 C12H11ClN2O
2-Chloro-4-amino-5-(2-tolyl)pyridine 2-Chloro-4-amino-5-(2-tolyl)pyridine 1381934-71-9 C12H11ClN2
2-Chloro-4-amino-5-(3-methoxyphenyl)pyridine 2-Chloro-4-amino-5-(3-methoxyphenyl)pyridine 1381942-31-9 C12H11ClN2O
2-Chloro-4-amino-6-(4-fluorophenyl)pyrimidine 2-Chloro-4-amino-6-(4-fluorophenyl)pyrimidine 1353856-21-9 C10H7ClFN3
2-Chloro-4-amino-6-(cyclohexyl)pyrimidine 2-Chloro-4-amino-6-(cyclohexyl)pyrimidine 1353857-11-0 C10H14ClN3
2-Chloro-4-bromo-6-(3-fluorophenyl)pyrimidine 2-Chloro-4-bromo-6-(3-fluorophenyl)pyrimidine 1412959-97-7 C10H5BrClFN2
2-Chloro-4-bromo-6-(3-tolyl)pyrimidine 2-Chloro-4-bromo-6-(3-tolyl)pyrimidine 1412954-39-2 C11H8BrClN2
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