Showing structure for (1r,2s,4r,9r,10r,14s,16s)-1-methyl-11-methylidene-3,8,13-trioxapentacyclo[7.6.1.0²,⁴.0⁶,¹⁶.0¹⁰,¹⁴]hexadec-5-ene-7,12-dione