O=C1[C@H]2[C@@H](C(=O)N1C1CCCCC1)[C@@H](c1ccc(Cl)cc1)N1C(=O)N(c3cccc(Br)c3)C(=O)[C@@]21Cc1ccc(Cl)cc1
Drug-like molecules usually have no more than 5 Hydrogen bond donor. How many hydrogen bond donor does the molecule have?