C=CC(C)(C)n1cc(C2=C(O)C(=O)C(c3c(CC=C(C)C)[nH]c4ccccc34)=C(O)C2=O)c2ccccc21
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?