A class of compounds characterized by the fusion of a thieno ring with a pyrimidine ring.
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3-amino-2-butyl-6-methyl-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one
3-carbethoxy-5,5-dimethyl-2-(N'-phenylthioureido)-4,5-dihydro-7H-thieno[2,3-c]thiopyran
