COc1cccc(C2C(C(=O)Nc3cc(=O)n(C)c(=O)n3C)=C(C)NC(C)=C2C(=O)Nc2cc(=O)n(C)c(=O)n2C)c1O
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?