C[C@@]12CCC(=O)C=C1CC[C@H]1[C@@H]2[C@@H](O)C[C@]2(C)[C@@H]1CC[C@@]2(O)C(=O)COC(=O)C1CCCC1
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?