Cc1c(OC(C)C(=O)NC[C@H]2CC[C@H](C(=O)O)CC2)ccc2c3c(c(=O)oc12)CCCC3
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?