CC(=O)O[C@H]1C[C@H]2CC[C@H]3[C@@H]4C[C@@H]([N+]5(C)CCCCC5)[C@@H](OC(C)=O)[C@@]4(C)CC[C@H]3[C@]2(C)C[C@H]1[N+]1(C)CCCCC1
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?