O=C(CC(O)(C(F)(F)F)C(F)(F)F)c1cc(CC(=O)C(O)(C(F)(F)F)C(F)(F)F)cc(CC(=O)C(O)(C(F)(F)F)C(F)(F)F)c1
Drug-like molecules usually have no more than 5 Hydrogen bond donor. How many hydrogen bond donor does the molecule have?