NEED HELP. WRITE NICELY WITH EXPLANATION

Question 14: During studies directed toward the synthesis of atropurpuran, a diterpene with interesting molecular architecture, the investigators used high temperature to convert an acyclic tetraene into a tricyclic compound, shown below. This transformation is believed to occur via two successive pericyclic processes (an electrocyclic ring-closing reaction, followed by a DielsAlder cycloaddition). Draw the mechanism as described. (1.5 points)