Nitrogen heterocycles

Item No.	Chemical Name	CAS No.	Structure	Typical Usage	CN Name
1	oxazolo[4,5-b]pyridin-2(3H)-one;	60832-72-6		Crizotinib,  azamethiphos	恶唑吡啶酮
2	2-Amino-3-hydroxypyridine； 2-Aminopyridin-3-ol	16867-03-1		Crizotinib,  azamethiphos	2-氨基-3-羟基吡啶
3	3-methyl-5-chloromethylpyridine hydrochloride； 3-(Chloromethyl)-5-methylpyridine hydrochloride	1007089-84-0		Rupatadine	3-甲基５-氯甲基叱咤盐酸盐
4	3-Amino-6-Methoxypyridazine; 6-Methoxypyridazin-3-amine	7252-84-8;		瑞卢戈利 Relugolix	3-氨基-6-甲氧基哒嗪 1589503-98-9 as HCl
5	3,6-Dichloropyridazine	141-30-0		Sulfachloropyridazine
6	4,6-Dichloro-2-(propylthio)pyrimidin-5-amine	145783-14-8		替卡格雷中间体 Ticagrelor
7	4-Chloro-6-Ethyl-5-Fluoropyrimidine	137234-74-3		伏立康唑中间体 Voriconazole
8	6-Fluoro-3-oxo-3,4-dihydropyrazine-2-carbonitrile; 6-fluoro-3-hydroxypyrazine-2-carbonitrile	356783-31-8		法匹拉韦中间体 Favipiravir
9	6-Bromo-3-hydroxypyrazine-2-carboxamide	259793-88-9		法匹拉韦中间体 Favipiravir
10	3-Aminopyrazine-2-Carboxylic Acid	5424-01-1		Favipiravir	3- 氨基吡嗪-2-羧酸
11	5-Methylpyrazine-2-carboxylic Acid	5521-55-1		Glipizide | Aximosi
12	2-Amino-4-hydroxypyridine hydrochloride	1187932-09-7
13	4,6-Dichloro-5-(2-methoxyphenoxy)-2,2′-bipyrimidine	150728-13-5		Bosentan
14	2-Amino-4,6-dimethoxypyrimidine	36315-01-2
15	4,6-Dihydroxypyrimidine	1193-24-4
16	2,3-Difluoro-5-chloropyridine; 5-Chloro-2,3-difluoropyridine	89402-43-7