O=C1NCN(c2ccccc2)C12CCN(C(c1ccnc3ccccc13)c1nnnn1-c1ccc3c(c1)OCCO3)CC2
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?