Cc1cn(C2C=CC(COP(=O)(OCC3=CC(=O)c4ccccc4C3=O)N(C)CCCCCl)O2)c(=O)[nH]c1=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?