Figure 5.

(a) Capped surface of AChE, showing the ACh binding pocket with AChE inhibitors pulmonarin A and B (blue sticks); (b) detailed view of known antifouling AChE inhibitors: pulmonarin A (light blue sticks) and pulmonarin B (dark blue sticks); (c) detailed view of test compounds 4 (purple sticks) and 5 (magenta sticks). Hydrogen interactions are represented with yellow broken line and stacking interactions with a double edge yellow arrow. Residues involved on those interactions are represented as green sticks and labeled. AChE is represented as solid surface, where carbon, hydrogen, oxygen, nitrogen, and sulfur are represented in green, grey, red, blue, and yellow, respectively.