CC(C)(C)OC(=O)CC[C@H](NC(=O)C1CCN(C(=O)OC(C)(C)C)CC1)c1nnc([C@H](Cc2ccc(OC(C)(C)C)cc2)NC(=O)OC(C)(C)C)o1
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?