Cc1ccc2c(O)c3c(cc2c1)C(=O)c1c2c(cc(O)c1C3=O)C1(C)OC(O2)C(O)C(N(C)C)C1O
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?