Showing structure for (1r,4s,13r,16e,19s)-4,15,15,19-tetramethyl-5,20-dioxapentacyclo[17.8.0.0⁴,¹³.0⁶,¹¹.0²¹,²⁶]heptacosa-6,8,10,16,21,23,25-heptaene