C=CC(C)(C)N[C@@H](C(=O)N1CCC[C@H]1c1nc(-c2nc(C(=O)OCC=C(C)C)c(C)o2)c(C)o1)C(C)C
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?