COC(=O)C1=C(OC(=O)/C(=C/c2ccccc2)c2ccc([N+](=O)[O-])cc2)C(C(=O)OC)[C@@]2(O)[C@@H](C(=O)OC)[C@H](C)C[C@@H]1[C@@H]2C(=O)OC
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?