| Structure | Chemical Name | CAS | MF | 
| ![1,3-Dihydrothiopheno[3,2-d]pyrimidine-2,4-dione](../cas/gif/16233-51-5.gif) | 1,3-Dihydrothiopheno[3,2-d]pyrimidine-2,4-dione | 16233-51-5 | C6H4N2O2S | 
| ![Thieno[2,3-d]pyrimidin-4(3H)one](../cas/gif/14080-50-3.gif) | Thieno[2,3-d]pyrimidin-4(3H)one | 14080-50-3 | C6H4N2OS | 
| ![THIENO[3,2-D]PYRIMIDIN-4(3H)-ONE](../cas/gif/16234-10-9.gif) | THIENO[3,2-D]PYRIMIDIN-4(3H)-ONE | 16234-10-9 | C6H4N2OS | 
| ![2,4-Dichlorothieno[2,3-d]pyrimidine](../cas/gif/18740-39-1.gif) | 2,4-Dichlorothieno[2,3-d]pyrimidine | 18740-39-1 | C6H2Cl2N2S | 
| ![2,4-Dichlorothieno[3,2-d]pyrimidine](../cas/gif/16234-14-3.gif) | 2,4-Dichlorothieno[3,2-d]pyrimidine | 16234-14-3 | C6H2Cl2N2S | 
| ![4-CHLOROTHIENO[2,3-D]PYRIMIDINE](../cas/gif/14080-59-2.gif) | 4-CHLOROTHIENO[2,3-D]PYRIMIDINE | 14080-59-2 | C6H3ClN2S | 
| ![4-Chlorothieno[3,2-d]pyrimidine](../cas/gif/16269-66-2.gif) | 4-Chlorothieno[3,2-d]pyrimidine | 16269-66-2 | C6H3ClN2S | 
| ![THIENO[2,3-D]PYRIMIDIN-4-AMINE](../cas/gif/14080-56-9.gif) | THIENO[2,3-D]PYRIMIDIN-4-AMINE | 14080-56-9 | C6H5N3S | 
| ![4-CHLORO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDINE](../cas/gif/108831-68-1.gif) | 4-CHLORO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDINE | 108831-68-1 | C8H7ClN2S | 
| ![4-CHLORO-7-METHYLTHIENO[3,2-D]PYRIMIDINE](../cas/gif/175137-21-0.gif) | 4-CHLORO-7-METHYLTHIENO[3,2-D]PYRIMIDINE | 175137-21-0 | C7H5ClN2S | 
|  | PYRANTEL TARTRATE SALT | 33401-94-4 | C15H20N2O6S | 
| ![4-HYDRAZINO-5-METHYLTHIENO[2,3-D]PYRIMIDINE](../cas/gif/19786-56-2.gif) | 4-HYDRAZINO-5-METHYLTHIENO[2,3-D]PYRIMIDINE | 19786-56-2 | C7H8N4S | 
| ![2,4-dichloro-6,7-dihydrothieno[3,2-d]pyrimidine](../cas/gif/74901-69-2.gif) | 2,4-dichloro-6,7-dihydrothieno[3,2-d]pyrimidine | 74901-69-2 | C6H4Cl2N2S | 
| ![4-CHLORO-6-ETHYLTHIENO[2,3-D]PYRIMIDINE](../cas/gif/81136-42-7.gif) | 4-CHLORO-6-ETHYLTHIENO[2,3-D]PYRIMIDINE | 81136-42-7 | C8H7ClN2S | 
| ![4-CHLORO-5-METHYLTHIENO[2,3-D]PYRIMIDINE](../cas/gif/43088-67-1.gif) | 4-CHLORO-5-METHYLTHIENO[2,3-D]PYRIMIDINE | 43088-67-1 | C7H5ClN2S | 
| ![Thieno[3,2-d]pyrimidine, 4-chloro-2-methyl-](../cas/gif/319442-16-5.gif) | Thieno[3,2-d]pyrimidine, 4-chloro-2-methyl- | 319442-16-5 | C7H5ClN2S | 
| ![2-Chlorothieno[3,2-d]pyrimidine](../cas2/gif/1119280-68-0.gif) | 2-Chlorothieno[3,2-d]pyrimidine | 1119280-68-0 | C6H3ClN2S | 
| ![4-CHLORO-2-METHYL-THIENO[2,3-D]PYRIMIDINE](../cas/gif/56843-79-9.gif) | 4-CHLORO-2-METHYL-THIENO[2,3-D]PYRIMIDINE | 56843-79-9 | C7H5ClN2S | 
|  | 5-(Chloromethyl)-2-thien-2-ylpyrimidine | 926921-78-0 | C9H7ClN2S | 
| ![4-chloro-5,7-dihydrothieno[3,4-d]pyrimidine](../cas/gif/53826-89-4.gif) | 4-chloro-5,7-dihydrothieno[3,4-d]pyrimidine | 53826-89-4 | C6H5ClN2S | 
| ![6-ETHYLTHIENO[2,3-D]PYRIMIDIN-4-AMINE](../cas/gif/879873-49-1.gif) | 6-ETHYLTHIENO[2,3-D]PYRIMIDIN-4-AMINE | 879873-49-1 | C8H9N3S | 
| ![6-T-BUTYL-4-PIPERAZINOTHIENO[3,2-D]PYRIMIDINE](../cas/gif/683274-69-3.gif) | 6-T-BUTYL-4-PIPERAZINOTHIENO[3,2-D]PYRIMIDINE | 683274-69-3 | C14H20N4S | 
| ![2,4-DICHLOROTHIENO[3,2-D]PYRIMIDINE](../structurefile/cb0386346.gif) | 2,4-DICHLOROTHIENO[3,2-D]PYRIMIDINE |  | C6H2Cl2N2S | 
| ![2-methylthieno[3,2-d]pyrimidin-4(3H)-one](../cas/gif/18678-13-2.gif) | 2-methylthieno[3,2-d]pyrimidin-4(3H)-one | 18678-13-2 | C7H6N2OS | 
| ![7-METHYL-3,4-DIHYDROTHIENO[3,2-D]PYRIMIDIN-4-ONE](../cas/gif/175137-13-0.gif) | 7-METHYL-3,4-DIHYDROTHIENO[3,2-D]PYRIMIDIN-4-ONE | 175137-13-0 | C7H6N2OS | 
| ![6-TERT-BUTYL-4-CHLOROTHIENO[2,3-D]PYRIMIDINE](../structurefile/cb1196131.gif) | 6-TERT-BUTYL-4-CHLOROTHIENO[2,3-D]PYRIMIDINE | 439692-55-4 | C10H11ClN2S | 
| ![4-(2-chlorothieno[2,3-d]pyriMidin-4-yl)Morpholine](../cas/gif/63894-67-7.gif) | 4-(2-chlorothieno[2,3-d]pyriMidin-4-yl)Morpholine | 63894-67-7 | C10H10ClN3OS | 
| ![5-TERT-BUTYL-4-CHLORO-THIENO[2,3-D]PYRIMIDINE](../cas/gif/827614-41-5.gif) | 5-TERT-BUTYL-4-CHLORO-THIENO[2,3-D]PYRIMIDINE | 827614-41-5 | C10H11ClN2S | 
|  | 4-(thiophen-2-yl)pyriMidin-2-ol | 1269294-26-9 | C8H6N2OS | 
| ![Thieno[3,2-d]pyrimidine-7-methanamine (9CI)](../cas/gif/871013-29-5.gif) | Thieno[3,2-d]pyrimidine-7-methanamine (9CI) | 871013-29-5 | C7H7N3S | 
| ![2-chloro-5-methylthieno[2,3-d]pyrimidine](../cas/gif/83259-31-8.gif) | 2-chloro-5-methylthieno[2,3-d]pyrimidine | 83259-31-8 | C7H5ClN2S | 
|  | BUTTPARK 146\18-29 | 108831-66-9 | C7H6N2OS | 
| ![2,4-Dichloro-7-methylthieno[3,2-d]pyrimidine](../cas/gif/35265-83-9.gif) | 2,4-Dichloro-7-methylthieno[3,2-d]pyrimidine | 35265-83-9 | C7H4Cl2N2S | 
| ![2,4-DICHLORO-5-METHYL-THIENO[2,3-D]PYRIMIDINE](../cas/gif/56844-38-3.gif) | 2,4-DICHLORO-5-METHYL-THIENO[2,3-D]PYRIMIDINE | 56844-38-3 | C7H4Cl2N2S | 
| ![4-Chloro-2-(methylsulfonyl)thieno[2,3-d]pyrimidine](../cas/gif/598298-11-4.gif) | 4-Chloro-2-(methylsulfonyl)thieno[2,3-d]pyrimidine | 598298-11-4 | C7H5ClN2O2S2 | 
|  | 2-Methyl-4-(thiophen-2-yl)pyriMidine | 154321-62-7 | C9H8N2S | 
| ![6-Methyl-3H-thieno[2,3-d]pyrimidin-4-one ,97%](../cas/20200401/gif/cb82128885.gif) | 6-Methyl-3H-thieno[2,3-d]pyrimidin-4-one ,97% |  | C7H6N2OS | 
| ![2,4-DICHLORO-6-METHYLTHIENO[3,2-D]PYRIMIDINE](../cas/gif/35265-82-8.gif) | 2,4-DICHLORO-6-METHYLTHIENO[3,2-D]PYRIMIDINE | 35265-82-8 | C7H4Cl2N2S | 
| ![6-TERT-BUTYL-3H-THIENO[2,3-D]PYRIMIDIN-4-ONE](../cas/gif/439692-54-3.gif) | 6-TERT-BUTYL-3H-THIENO[2,3-D]PYRIMIDIN-4-ONE | 439692-54-3 | C10H12N2OS | 
| ![2-(Methylsulfonyl)thieno[2,3-d]pyrimidine](../cas/gif/598298-12-5.gif) | 2-(Methylsulfonyl)thieno[2,3-d]pyrimidine | 598298-12-5 | C7H6N2O2S2 | 
| ![4-CHLORO-6-METHYLTHIENO[2,3-D]PYRIMIDINE](../cas/gif/106691-21-8.gif) | 4-CHLORO-6-METHYLTHIENO[2,3-D]PYRIMIDINE | 106691-21-8 | C7H5ClN2S |