COC(=O)c1cccc(C23CC4(C2)[C@@H](c2ccccc2)N(CC2CCCCC2)C[C@@H]4C3c2ccccc2)c1
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?