Showing structure for 3,13,19,28-tetramethyl-4,7,11,16,21,29,30-heptaoxaspiro[heptacyclo[25.2.1.1¹⁷,²⁰.0³,⁵.0⁹,¹⁵.0⁹,¹⁹.0¹⁰,¹²]hentriacontane-18,2'-oxirane]-13,23,25-triene-6,22-dione