How to remove molding at rear edge of vinyl top

This is the molding that goes from the bottom of the C pillar then across the Dutchman panel. At the C pillar there is a screw. Farther back there are a couple of plastic clips. But about an inch forward of the corner, there's something keeping the molding on. What is it and how do I get it off? (What I'm talking about is right at the bottom edge of this picture.)

rear_window_vinyl.png