CNC1C(O)C(OC2C(N)CC(N)C(OC3OC(C(C)O)C(O)C(O)C3N)C2O)OCC1(C)O.O=S(=O)(O)O
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?