CCC1OC(=O)CC(O)C(C)C(OC2OC(C)C(O)C(N(C)C)C2O)C(CC=O)CC(C)C(=O)/C=C/C2(C)OC2C1C
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?