O=C(CSc1nnc(CCCN2C(=O)c3cccc4cccc(c34)C2=O)n1-c1ccccc1)NCCCN1CCOCC1
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?