108347-21-3
4-oxocyclopent-2-en-1-yl acrylate
→
~6%
4945-71-5
3a,6a-dihydropentalene-1,4-dione
+
108347-22-4
bicyclo[3.3.0]octa-4,7-diene-2,6-dione
765-56-0
4-bromocyclopent-2-en-1-one