COc1ccc(OC)c(C2C(C(=O)c3ccc4c(c3)OCCO4)=C(O)C(=O)N2CC2CCCO2)c1
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?