C[C@H]1O[C@@H](CC(=O)O)Cc2c(O)c3c(c(O)c21)C(=O)C=C(C1=CC(=O)c2c(O)c4c(c(O)c2C1=O)C[C@H](CC(=O)O)O[C@@H]4C)C3=O
The donor in a hydrogen bond is usually a strongly electronegative atom such as N, O, or F that is covalently bonded to a hydrogen bond. How many hydrogen bond donors does the molecule have?