Drug DB01977 binds with the binding pocket between the three chains, A, B and C of 6wuu.pdb. Chain A is green, chain B is blue, chain C is yellow and chain D is magenta. The drug DB01977 is red with binding bonds with chain A (green). This shows that drug binds with the binding pockets situated between chains than binding pockets of individual chains for better affinity. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)