CSc1nc(N)c2ncn([C@@H]3O[C@H](COP(=O)(O)OP(=O)(O)O)C(O)[C@H]3O)c2n1
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?