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Heterocyclic Compounds

Heterocyclic compounds are a class of compounds that consist of carbon atoms and non-carbon atoms altogether forming a cyclic skeletal structure. These non-carbon atoms are collectively referred to as a heteroatom. The common heteroatoms include nitrogen, oxygen, and sulfur. Lactones, lactams, cyclic ethers that we’ve already learned are heterocyclic compounds. With similar properties of congeneric open-chain compounds, they will be discussed in corresponding chapters. This chapter will mainly discuss heterocyclic compounds with relatively stable ring system and with a certain degree of aromaticity, also known as aromatic heterocyclic compound.

There are many kinds and a large number of heterocyclic compounds widely distributed in nature. Many natural heterocyclic compounds in animals and plants play an important physiological role in the body. For example, heterocyclic structure exists in chlorophyll in plants, hemoglobin in animal blood, alkaloids and glycosides as the active ingredient in herbs, some antibiotics and vitamins, certain composition of amino acids in protein and bases in nucleotide. About half of the existing medicines have heterocyclic structures. Thus, heterocyclic compounds play an important role in organic compounds especially in organic medicines.

The most common and also the most important heterocyclic compounds are that with five-membered or six-membered heterocyclic ring and their fused heterocyclic compounds. Therefore, according to the size of the ring, heterocyclic compounds can be divided into five-membered compounds and six-membered heterocyclic compounds. E.g., furan, thiophene, pyrrole, imidazole, triazole and their fused heterocyclic compounds, indole, benzimidazole and diphenylene-oxide are all five-membered heterocyclic compounds, while pyridine, pyrimidine and their fused heterocyclic compounds, quinoline and quinazoline are all six-membered heterocyclic compounds.

According to the number of hetero atoms, five-membered compounds and six-membered heterocyclic compounds can be divided into one-hetero-atom-containing heterocyclic compounds and two-hetero-atom-containing and several-hetero-atom-containing heterocyclic compounds. E.g., furan, thiophene, pyridine, indole, quinoline, dibenzofuran, etc. are one-hetero-atom-containing heterocyclic compounds; imidazole, pyrimidine, benzimidazole, quinazoline, etc. are two-hetero-atom-containing heterocyclic compounds; purine, comprising more than two hetero atoms, is a several-hetero-atom-containing heterocyclic compound. According to the form of the ring in the molecule, heterocyclic compounds can be divided into single-heterocyclic compounds and fused heterocyclic compounds. E.g., furan, pyridine, pyrimidine, imidazole, etc. are single-heterocyclic compounds and indole, quinoline, dibenzofuran, purines, etc. are fused heterocyclic compounds.

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Structure Chemical Name CAS MF
6-Chloro-5-(4-tolyl)pyridine-3-boronic acid pinacol ester 6-Chloro-5-(4-tolyl)pyridine-3-boronic acid pinacol ester 2223052-22-8 C18H21BClNO2
6-Chloro-5-(iso-butyl)pyridine-3-boronic acid pinacol ester 6-Chloro-5-(iso-butyl)pyridine-3-boronic acid pinacol ester 2223030-07-5 C15H23BClNO2
6-Chloro-5-(n-propoxy)pyridine-3-boronic acid pinacol ester 6-Chloro-5-(n-propoxy)pyridine-3-boronic acid pinacol ester 2223039-07-2 C14H21BClNO3
6-cyclohexyl-2-(propan-2-yl)pyrimidin-4-amine 6-cyclohexyl-2-(propan-2-yl)pyrimidin-4-amine 1412957-87-9 C13H21N3
Bis(1,1-dimethylethyl)(tetrahydro-2-furanyl)phosphine Bis(1,1-dimethylethyl)(tetrahydro-2-furanyl)phosphine 1621084-37-4 C12H25OP
Methyl 3-bromo-2-pyridinecarboxylate-4-boronic acid pinacol ester Methyl 3-bromo-2-pyridinecarboxylate-4-boronic acid pinacol ester 2223027-31-2 C13H17BBrNO4
N-Boc-2-(3-Amino-2-pyridinyl)morpholine N-Boc-2-(3-Amino-2-pyridinyl)morpholine 1622835-35-1 C14H21N3O3
tert-butyl 2-(2-aminopyrimidin-5-yl)morpholine-4-carboxylate tert-butyl 2-(2-aminopyrimidin-5-yl)morpholine-4-carboxylate 1622835-23-7 C13H20N4O3
tert-butyl 2-(5-aminopyrimidin-2-yl)morpholine-4-carboxylate tert-butyl 2-(5-aminopyrimidin-2-yl)morpholine-4-carboxylate 1821324-57-5 C13H20N4O3
tert-butyl 2-(6-bromopyridin-2-yl)morpholine-4-carboxylate tert-butyl 2-(6-bromopyridin-2-yl)morpholine-4-carboxylate 1622836-24-1 C14H19BrN2O3
tert-butyl 3-(5-aminopyridin-3-yl)pyrrolidine-1-carboxylate tert-butyl 3-(5-aminopyridin-3-yl)pyrrolidine-1-carboxylate 1440428-00-1 C14H21N3O2
tert-butyl 3-(6-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)piperidine-1-carboxylate tert-butyl 3-(6-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)piperidine-1-carboxylate 2223009-04-7 C21H32BFN2O4
(2-(propan-2-yl-d7)pyrimidin-5-yl)boronic acid (2-(propan-2-yl-d7)pyrimidin-5-yl)boronic acid 2241866-09-9 C7H11BN2O2
1-(2-(methyl-d3)pyridin-4-yl-3,5,6-d3)-1H-pyrazol-3,5-d2-4-amine 1-(2-(methyl-d3)pyridin-4-yl-3,5,6-d3)-1H-pyrazol-3,5-d2-4-amine 2256707-90-9 C9H2D8N4
1-(2-Bromo-4-pyridyl)-4-bromopyrazole 1-(2-Bromo-4-pyridyl)-4-bromopyrazole 1353857-20-1 C8H5Br2N3
1-(2-BROMOPYRIDIN-4-YL)PIPERIDIN-3-OL 1-(2-BROMOPYRIDIN-4-YL)PIPERIDIN-3-OL 1563530-26-6 C10H13BrN2O
1-(2-fluorophenyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-1,2,3-triazole 1-(2-fluorophenyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-1,2,3-triazole 2256756-26-8 C14H17BFN3O2
1-(3-AMINOPYRIDIN-2-YL)PIPERIDIN-2-OL 1-(3-AMINOPYRIDIN-2-YL)PIPERIDIN-2-OL 1563531-65-6 C10H15N3O
1-(4-bromo-2-fluorophenyl)-1H-imidazole 1-(4-bromo-2-fluorophenyl)-1H-imidazole 190199-37-2 C9H6BrFN2
1-(4-bromo-3-cyclopropylphenyl)pyrrolidine 1-(4-bromo-3-cyclopropylphenyl)pyrrolidine 2222937-27-9 C13H16BrN
1-(4-chlorophenyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-1,2,3-triazole 1-(4-chlorophenyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-1,2,3-triazole 2256758-12-8 C14H17BClN3O2
1-(5-Chloro-2-pyrimidyl)-4-bromopyrazole 1-(5-Chloro-2-pyrimidyl)-4-bromopyrazole 1353857-16-5 C7H4BrClN4
1-(pyridin-2-yl-d4)-1H-imidazol-2,5-d2-4-amine 1-(pyridin-2-yl-d4)-1H-imidazol-2,5-d2-4-amine 2256707-83-0 C8H8N4
1-Cyclobutyl-1H-1,2,3-triazol-4-amine 1-Cyclobutyl-1H-1,2,3-triazol-4-amine 1622840-59-8 C6H10N4
1-Cyclopentyl-1H-1,2,3-triazol-4-amine 1-Cyclopentyl-1H-1,2,3-triazol-4-amine 1507035-50-8 C7H12N4
2-((propan-2-yl-d7)oxy)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,5-d3 2-((propan-2-yl-d7)oxy)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,5-d3 2241870-04-0 C14H12BD10NO3
2-(1H-imidazol-1-yl-d3)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,6-d3 2-(1H-imidazol-1-yl-d3)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,6-d3 2256709-79-0 C14H18BN3O2
2-(1H-imidazol-2-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(1H-imidazol-2-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2256755-55-0 C14H18BN3O2
2-(2-(methyl-d3)propan-2-yl-1,1,1,3,3,3-d6)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,5-d3 2-(2-(methyl-d3)propan-2-yl-1,1,1,3,3,3-d6)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,5-d3 2241869-96-3 C15H12BD12NO2
2-(2-METHOXYPHENYL)PYRIDIN-4-AMINE 2-(2-METHOXYPHENYL)PYRIDIN-4-AMINE 876601-38-6 C12H12N2O
2-(3-(methyl-d3)-1H-pyrazol-1-yl-4,5-d2)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-4,6-d2 2-(3-(methyl-d3)-1H-pyrazol-1-yl-4,5-d2)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-4,6-d2 2256705-32-3 C14H19BN4O2
2-(3-Furyl)thiazole 2-(3-Furyl)thiazole 42177-87-7 C7H5NOS
2-(3-Methoxyphenyl)-5-hydroxythiazole 2-(3-Methoxyphenyl)-5-hydroxythiazole 1159814-72-8 C10H9NO2S
2-(4-(methyl-d3)-1H-imidazol-1-yl-2,5-d2)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(4-(methyl-d3)-1H-imidazol-1-yl-2,5-d2)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2256706-25-7 C15H20BN3O2
2-(4-(methyl-d3)-1H-pyrazol-1-yl-3,5-d2)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,5-d3 2-(4-(methyl-d3)-1H-pyrazol-1-yl-3,5-d2)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3,4,5-d3 2256706-21-3 C15H20BN3O2
2-(4-bromo-1H-imidazol-1-yl-2,5-d2)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(4-bromo-1H-imidazol-1-yl-2,5-d2)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2256706-86-0 C14H17BBrN3O2
2-(4-bromo-1H-pyrazol-1-yl-3,5-d2)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-4,6-d2 2-(4-bromo-1H-pyrazol-1-yl-3,5-d2)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-4,6-d2 2256705-48-1 C13H16BBrN4O2
2-(4-bromophenyl)-5-(methyl-d3)pyridine-3,4,6-d3 2-(4-bromophenyl)-5-(methyl-d3)pyridine-3,4,6-d3 2256711-82-5 C12H10BrN
2-(4-Ethylphenyl)-4-hydroxythiazole 2-(4-Ethylphenyl)-4-hydroxythiazole 1159820-27-5 C11H11NOS
2-(4-tert-Butylphenyl)-4-hydroxythiazole 2-(4-tert-Butylphenyl)-4-hydroxythiazole 1159821-44-9 C13H15NOS
2-(4-Tolyl)-4-hydroxythiazole 2-(4-Tolyl)-4-hydroxythiazole 1159817-49-8 C10H9NOS
2-(5-bromothiophen-2-yl)-1,4-dioxane 2-(5-bromothiophen-2-yl)-1,4-dioxane 2222935-29-5 C8H9BrO2S
2-(Cyclopentyl)-5-hydroxythiazole 2-(Cyclopentyl)-5-hydroxythiazole 1159819-16-5 C8H11NOS
2-(ethoxy-d5)pyridin-3,5,6-d3-4-amine 2-(ethoxy-d5)pyridin-3,5,6-d3-4-amine 2259316-23-7 C7H10N2O
2-(methoxy-d3)pyridin-4,5,6-d3-3-amine 2-(methoxy-d3)pyridin-4,5,6-d3-3-amine 2256707-71-6 C6H8N2O
2-(methyl-d3)-4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazol-1-yl-2,5-d2)pyridine-3,5,6-d3 2-(methyl-d3)-4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazol-1-yl-2,5-d2)pyridine-3,5,6-d3 2256706-18-8 C15H20BN3O2
2-(piperazin-1-yl-2,2,3,3,5,5,6,6-d8)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-4,6-d2 2-(piperazin-1-yl-2,2,3,3,5,5,6,6-d8)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-4,6-d2 2241866-04-4 C14H23BN4O2
2-(SEC-BUTYL)PYRIDIN-3-AMINE 2-(SEC-BUTYL)PYRIDIN-3-AMINE 1496883-98-7 C9H14N2
2-(tert-butoxy)-6-cyclobutyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(tert-butoxy)-6-cyclobutyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2256755-10-7 C19H30BNO3
2-(tert-butoxy)-6-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2-(tert-butoxy)-6-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2256755-36-7 C15H23BFNO3
2-(tetrahydrofuran-3-yl)pyridin-4-ol 2-(tetrahydrofuran-3-yl)pyridin-4-ol 2222935-52-4 C9H11NO2
2,3-Dibromo-4-(2-thienyl)pyridine 2,3-Dibromo-4-(2-thienyl)pyridine 1381941-07-6 C9H5Br2NS
2,3-Dibromo-4-(3-furyl)pyridine 2,3-Dibromo-4-(3-furyl)pyridine 1381942-81-9 C9H5Br2NO
2,3-Dibromo-4-(4-methylpiperidin-1-yl)pyridine 2,3-Dibromo-4-(4-methylpiperidin-1-yl)pyridine 1381942-84-2 C11H14Br2N2
2,3-Dibromo-4-(5-pyrimidyl)pyridine 2,3-Dibromo-4-(5-pyrimidyl)pyridine 1381942-91-1 C9H5Br2N3
2,3-Dibromo-5-(2-fluorophenyl)pyridine 2,3-Dibromo-5-(2-fluorophenyl)pyridine 1399481-43-6 C11H6Br2FN
2,3-Dibromo-5-(n-propyl)pyridine 2,3-Dibromo-5-(n-propyl)pyridine 1399481-79-8 C8H9Br2N
2,4-Dibromo-3-(3-methoxyphenyl)pyridine 2,4-Dibromo-3-(3-methoxyphenyl)pyridine 1381941-06-5 C12H9Br2NO
2,4-Dibromo-3-(4-fluorophenyl)pyridine 2,4-Dibromo-3-(4-fluorophenyl)pyridine 1381941-14-5 C11H6Br2FN
2,4-Dibromo-6-(2-furyl)-1,3,5-triazine 2,4-Dibromo-6-(2-furyl)-1,3,5-triazine 1374664-36-4 C7H3Br2N3O
2,4-Dibromo-6-(4-chlorophenyl)-1,3,5-triazine 2,4-Dibromo-6-(4-chlorophenyl)-1,3,5-triazine 1374664-99-9 C9H4Br2ClN3
2,4-Dibromo-6-(4-trifluoromethylphenyl)-1,3,5-triazine 2,4-Dibromo-6-(4-trifluoromethylphenyl)-1,3,5-triazine 1374665-68-5 C10H4Br2F3N3
2,4-Dichloro-5-(oxan-4-yl)pyrimidine 2,4-Dichloro-5-(oxan-4-yl)pyrimidine 1563531-98-5 C9H10Cl2N2O
2,4-Dichloro-6-(3,5-difluorophenyl)-1,3,5-triazine 2,4-Dichloro-6-(3,5-difluorophenyl)-1,3,5-triazine 1227958-94-2 C9H3Cl2F2N3
2,4-Dichloro-6-(3-thienyl)-1,3,5-triazine 2,4-Dichloro-6-(3-thienyl)-1,3,5-triazine 37856-96-5 C7H3Cl2N3S
2,4-Dichloro-6-(n-propyl)triazine 2,4-Dichloro-6-(n-propyl)triazine 30894-73-6 C6H7Cl2N3
2,4-Dichloro-6-(tert-butyl)1,3,5-triazine 2,4-Dichloro-6-(tert-butyl)1,3,5-triazine 705-23-7 C7H9Cl2N3
2,5-Dibromo-4-(2-chlorophenyl)thiazole 2,5-Dibromo-4-(2-chlorophenyl)thiazole 1314354-88-5 C9H4Br2ClNS
2,5-Dibromo-4-(2-tolyl)thiazole 2,5-Dibromo-4-(2-tolyl)thiazole 1314354-08-9 C10H7Br2NS
2,5-Dibromo-4-(iso-propyl)thiazole 2,5-Dibromo-4-(iso-propyl)thiazole 1314357-17-9 C6H7Br2NS
2,5-dibromopyridin-3,6-d2-4-amine 2,5-dibromopyridin-3,6-d2-4-amine 2294957-77-8 C5H2Br2D2N2
2-AMINO-3-(4-METHYLPIPERIDIN-1-YL)PYRIDINE 2-AMINO-3-(4-METHYLPIPERIDIN-1-YL)PYRIDINE 1563529-73-6 C11H17N3
2-Amino-3,5-dibromo-4,4'-bipyridine 2-Amino-3,5-dibromo-4,4'-bipyridine 1563529-69-0 C10H7Br2N3
2-Amino-3-bromo-4-(3-chlorophenyl)pyridine 2-Amino-3-bromo-4-(3-chlorophenyl)pyridine 1381942-93-3 C11H8BrClN2
2-Amino-3-bromo-4-(3-methyl-1H-pyrazol-1-yl)pyridine 2-Amino-3-bromo-4-(3-methyl-1H-pyrazol-1-yl)pyridine 1381941-13-4 C9H9BrN4
2-Amino-3-bromo-4-(5-pyrimidyl)pyridine 2-Amino-3-bromo-4-(5-pyrimidyl)pyridine 1381943-78-7 C9H7BrN4
2-Amino-3-bromo-4-(iso-propyl)pyridine 2-Amino-3-bromo-4-(iso-propyl)pyridine 1381941-02-1 C8H11BrN2
2-Amino-4-(2-tolyl)thiophene 2-Amino-4-(2-tolyl)thiophene 1159817-01-2 C11H11NS
2-Amino-4-(cyclopropyl)furan 2-Amino-4-(cyclopropyl)furan 1159819-12-1 C7H9NO
2-Amino-4-(imidazol-1-yl)thiazole 2-Amino-4-(imidazol-1-yl)thiazole 1314356-22-3 C6H6N4S
2-AMINO-4-(TETRAHYDROFURAN-3-YLOXY)PYRIDINE 2-AMINO-4-(TETRAHYDROFURAN-3-YLOXY)PYRIDINE 1314354-97-6 C9H12N2O2
2-Amino-4-bromo-3-(2-furyl)pyridine 2-Amino-4-bromo-3-(2-furyl)pyridine 1381940-71-1 C9H7BrN2O
2-Amino-4-bromo-3-(cyclobutyl)pyridine 2-Amino-4-bromo-3-(cyclobutyl)pyridine 1381934-52-6 C9H11BrN2
2-Amino-4-bromo-3-phenylpyridine 2-Amino-4-bromo-3-phenylpyridine 1381941-81-6 C11H9BrN2
2-Amino-4-chloro-3-(n-propyl)pyridine 2-Amino-4-chloro-3-(n-propyl)pyridine 1381944-00-8 C8H11ClN2
2-Amino-4-chloro-6-(2-fluorophenyl)pyrimidine 2-Amino-4-chloro-6-(2-fluorophenyl)pyrimidine 1353857-10-9 C10H7ClFN3
2-Amino-4-chloro-6-(3-furyl)-1,3,5-triazine 2-Amino-4-chloro-6-(3-furyl)-1,3,5-triazine 1303967-36-3 C7H5ClN4O
2-Amino-4-chloro-6-(3-pyridyl)pyrimidine 2-Amino-4-chloro-6-(3-pyridyl)pyrimidine 569657-97-2 C9H7ClN4
2-Amino-4-chloro-6-(4-trifluoromethylphenyl)pyrimidine 2-Amino-4-chloro-6-(4-trifluoromethylphenyl)pyrimidine 1353854-45-1 C11H7ClF3N3
2-Amino-5-(2-methoxyphenyl)thiazole 2-Amino-5-(2-methoxyphenyl)thiazole 1184644-86-7 C10H10N2OS
2-AMINO-5-(4-METHYL-1H-PYRAZOL-1-YL)PYRIDINE 2-AMINO-5-(4-METHYL-1H-PYRAZOL-1-YL)PYRIDINE 1179886-78-2 C9H10N4
2-Amino-5-(cyclopropyl)thiophene 2-Amino-5-(cyclopropyl)thiophene 1159816-76-8 C7H9NS
2-AMINO-6-(3,4-DIFLUOROPHENYL)PYRIDINE 2-AMINO-6-(3,4-DIFLUOROPHENYL)PYRIDINE 1159820-25-3 C11H8F2N2
2-BROMO-3-(1,3-THIAZOL-5-YL)PYRIDINE 2-BROMO-3-(1,3-THIAZOL-5-YL)PYRIDINE 1563534-71-3 C8H5BrN2S
2-BROMO-3-(4-ETHYLPHENYL)PYRIDINE 2-BROMO-3-(4-ETHYLPHENYL)PYRIDINE 1563532-14-8 C13H12BrN
2-Bromo-3-(diethylamino)pyridine 2-Bromo-3-(diethylamino)pyridine 1563529-63-4 C9H13BrN2
2-bromo-4-(1H-pyrazol-1-yl-d3)pyridine 2-bromo-4-(1H-pyrazol-1-yl-d3)pyridine 2256707-38-5 C8H6BrN3
2-bromo-4-(2-bromophenyl)pyridine-3,5,6-d3 2-bromo-4-(2-bromophenyl)pyridine-3,5,6-d3 2256711-66-5 C11H7Br2N
2-Bromo-4-(2-methylpyrimidyl-5-yl)thiazole 2-Bromo-4-(2-methylpyrimidyl-5-yl)thiazole 1215072-77-7 C8H6BrN3S
2-Bromo-4-(3-aminophenyl)pyridine 2-Bromo-4-(3-aminophenyl)pyridine 1563532-74-0 C11H9BrN2
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