2H-cyclopent[d]oxepin-2,4(1H)-dione, 5,6,7,8-tetrahydro-6,6,7,7,8,8-hexamethyl- 6,6,7,7,8,8-hexamethyl-5,6,7,8-tetrahydro-2H-cyclopenta[d]oxepine-2,4(1H)-dione InChI=1/C15H22O3/c1-13(2)9-7-11(16)18-12(17)8-10(9)14(3,4)15(13,5)6/h7-8H2,1-6H