COc1ccc2cc1Oc1ccc(cc1)CC1c3cc4c(cc3CCN1C)Oc1c(OC)cc3c(c1O4)C(C2)N(C)CC3
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?