Showing structure for 13,17-dihydroxy-12-(hydroxymethyl)-5-methoxy-7-methyl-9,15-dioxo-2,10,16-trioxatetracyclo[9.7.0.0³,⁸.0¹⁴,¹⁸]octadeca-1(11),3,5,7,12,14(18)-hexaene-4-carbaldehyde