Showing structure for (1r,2s,5s,6r,7s,10r,11s,14s,15r,16s)-2,6,11,15-tetramethyl-5,14-dipropyl-4,13,19,20-tetraoxatricyclo[14.2.1.1⁷,¹⁰]icosane-3,12-dione