1,3-cyclopentadiene, 5-chloro-1,2,3,4,5-pentamethyl- 5-chloro-1,2,3,4,5-pentamethylcyclopenta-1,3-diene InChI=1/C10H15Cl/c1-6-7(2)9(4)10(5,11)8(6)3/h1-5H