CC(C)[C@@H]1CC[C@@H](C)C[C@H]1OC(=O)c1c2n(c3ccccc13)C[C@H]1OC(C)(C)O[C@@H]21
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?