CN1c2ccccc2C2=C(c3ccccc3)CC[C@@H](C(=O)N3C4C[C@H]5CC[C@@]4(CS3(=O)=O)C5(C)C)[C@@H]21
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?