O=C(NCC1CCCO1)C(c1ccc(N2CCOCC2)cc1)N(C(=O)Cn1nnc2ccccc21)c1ccccc1F
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?