1,5-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one 8-oxabicyclo[3.2.1]oct-6-en-3-one, 1,5-dimethyl- InChI=1/C9H12O2/c1-8-3-4-9(2,11-8)6-7(10)5-8/h3-4H,5-6H2,1-2H