tert-Butyl 2'-chloro-4'-oxo-4',5'-dihydrospiro[piperidine-4,7'-thieno[2,3-c]pyran]-1-carboxylate 5g

tert-Butyl 2'-chloro-4'-oxo-4',5'-dihydrospiro[piperidine-4,7'-thieno[2,3-c]pyran]-1-carboxylate 5g