Showing structure for 12-({2a-hydroxy-3,5,7a-trimethyl-1h,2h,4h,6h,6ah,7h-cyclobuta[f]inden-5-yl}methoxy)-5,5-dimethyl-10-oxo-11-oxatetracyclo[7.3.1.0¹,⁹.0³,⁷]tridec-2-ene-2-carbaldehyde