O=C(Oc1cc(OC(=O)c2ccccc2)c2c(c1)OC(c1ccc(OC(=O)c3ccccc3)c(OC(=O)c3ccccc3)c1)[C@@H](OC(=O)c1ccccc1)C2)c1ccccc1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?