This is the structural formula of vitamin A, a vitamin important in human nutrition. 
https://moodle.umkc.edu/pluginfile.php/239657/mod_forum/post/41114/vitaminA.jpg
vitaminA

After not eating all day and feeling absolutely famished, you eat a meal high in vitamin A. Predict and explain what type of transport process (described in class; ie, simple diffusion, facilitated diffusion, or active transport) that you expect the vitamin to use to cross your intestinal membranes.