Showing structure for (4r,6s,10r,12s,13s,17s,18r)-4,10,18-trihydroxy-13-methyl-7-methylidene-8-oxo-3-oxapentacyclo[7.7.1.1⁶,⁹.0¹,¹².0⁴,¹⁷]octadecane-13-carbaldehyde