CCC1=C2CC[C@H]3C(=O)NC(=O)[C@H]3[C@H]2[C@@]2(C)/C(=N/CC3CC3)OC(=O)N2C1=O
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?