O=C(CN1CCN(C(=O)OCc2ccccc2)CCN(CC(=O)N2CCCCC2)CCN(C(=O)OCc2ccccc2)CC1)N1CCCCC1
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?