CC(C)[C@@H](C(=O)N[C@@H](C(=O)O)c1ccccc1)N1C(=O)N2CCc3c([nH]c4ccccc34)[C@@]2(C)C1=O
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?