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