O=C(O)CCCN1C(=O)C2C3C=CC(C2C1=O)C1C(=O)N(CCCC(=O)O)C(=O)C31
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?