C=CCn1c(SCC(=O)c2[nH]c(C)c(C(=O)OCC)c2C)nc2scc(-c3ccc(OC)cc3)c2c1=O
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?