COC(=O)C1=C(C)N2[C@H](C(=O)O)CO[C@@]2(C)[C@H](C(=O)OC)[C@H]1c1cccc([N+](=O)[O-])c1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?