Cc1cc2c(c(C(=O)NCC(=O)N[C@@H](C)C(=O)OCc3ccccc3)c1)Oc1c(cc(C)cc1C(=O)NCC(=O)N[C@@H](C)C(=O)OCc1ccccc1)S2
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?