Cc1nnc(N2C(=O)C(O)=C(C(=O)c3ccc4c(c3)CC(C)O4)C2c2ccccc2)s1
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?