COC(=O)C1=C(OC(=O)/C=C/c2ccc(Cl)cc2)C(C(=O)OC)[C@]2(O)[C@@H](C(=O)OC)[C@H]1C[C@@H](c1ccccc1)[C@@H]2C(=O)OC
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?