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
Drug-like molecules usually have no more than 5 Hydrogen bond donor. How many hydrogen bond donor does the molecule have?