1,3-cyclopentadiene, 5-methoxy-1,2,3,4,5-pentamethyl- 5-methoxy-1,2,3,4,5-pentamethylcyclopenta-1,3-diene InChI=1/C11H18O/c1-7-8(2)10(4)11(5,12-6)9(7)3/h1-6H