4-Chlorothieno[3,2-d]pyrimidine (CAS NO.16269-66-2), its Synonyms are Thieno[3,2-d]pyrimidine, 4-chloro- ; 4-Chlorothieno[3,2-d]pyrimidine ,97% ; 4-Chlorothieno[3,2-b]pyrimidine .