O=C(O)CCCCCNC(=O)CCC(CN(CC(=O)OCc1ccccc1)CC(=O)OCc1ccccc1)N(CC(=O)OCc1ccccc1)CC(=O)OCc1ccccc1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?