87255-77-4
diethyl phthalazine-6,7-dicarboxylate
→
260-63-9
pyridazino[4,5-g]phthalazine
87255-76-3
diethyl 1,2-diformyl-4,5-benzenedicarboxylate
6634-01-1
tetraethyl benzene-1,2,4,5-tetracarboxylate