COC(=O)c1ccc(OC)c(Cn2c(=O)n(Cc3ccccc3)c(=O)c3c2c2cc(OC)ccc2n3C)c1
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?