CC[C@@H](CO)NC(=O)[C@H]1C=C2c3cccc4c3c(cn4C)C[C@H]2N(C)C1.O=C(O)/C=C\C(=O)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?