COc1ccc(CCNC(=O)CCc2c(C)nc3c(c(C)nn3-c3ccc(C)c(C)c3)c2C)c(OC)c1OC
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?