19137-24-7
→
412338-39-7
2,3-Dihydrothieno[3,4-d]pyridazine-1,4-dione
53229-47-3
diethyl thiophene-3,4-dicarboxylate
7-chloro-5H-thieno[2,3-d]pyridazin-4-one
699-86-5
1,4-dichlorothieno[3,4-d]pyridazine