Showing structure for 3,5',6,15'-tetramethylidene-4,5,6a,7,9a,9b-hexahydro-3ah-3'-oxaspiro[azuleno[4,5-b]furan-9,12'-tetracyclo[7.6.1.0²,⁶.0¹³,¹⁶]hexadecan]-13'(16')-ene-2,4',8,14'-tetrone