CCOC(=O)N1C=CC(=C2C(=C3C=CN(C(=O)OCC)C=C3)C(=C3C=CN(C(=O)OCC)C=C3)C2=C2C=CN(C(=O)OCC)C=C2)C=C1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?