CSc1nc2c(nc(C)c(=O)n2C2OCC(OC(C)=O)C(OC(C)=O)C2OC(C)=O)c(=O)[nH]1
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?