tert-Butyl 4-oxo-3,5,6,8-tetrahydropyrido[4',3':4,5]-thieno[2,3-d]pyrimidine-7(4H)-carboxylate 5g

tert-Butyl 4-oxo-3,5,6,8-tetrahydropyrido[4',3':4,5]-thieno[2,3-d]pyrimidine-7(4H)-carboxylate 5g