O=C(CNC(=O)OCc1ccccc1)NCCCCC(NC(=O)OCc1ccccc1)C(=O)NC(CCCCNC(=O)CNC(=O)OCc1ccccc1)C(=O)OCc1ccccc1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?