COc1ccc(OC)c(-n2c(=O)[nH]c3cc(C(=O)NCCc4ccc(OC)c(OC)c4)ccc3c2=O)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?