O=C(O)CN(CC(=O)O)Cc1cc2c(-c3ccccc3C(=O)O)c3cc(CN(CC(=O)O)CC(=O)O)c(=O)cc-3oc2cc1O
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?