7-dihydrothieno[3

tert-butyl 3-BroMo-6

2,4-Dichloro-6,7-dihydro-thieno[3,2-

2,4-Dichloro-6,7-dihyrothieno[3,2-d]pyrimidine

2,4-dichloro-6,7-dihydrothieno[3,2-d]pyrimidine