CCOC(=O)c1ccc(-n2c(-c3ccc(C)cc3)c(C)n3c4c(=O)n(C)c(=O)n(C)c4nc23)cc1
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?