COc1ccc(C2C(C(=O)c3ccc4c(c3)CC(C)O4)=C(O)C(=O)N2CCN2CCOCC2)cc1OC
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?