COc1ccc(N2CC(C(=O)NCCN3C(=O)S/C(=C\c4cccnc4)C3=O)CC2=O)c(OC)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?