Oc1c(NCn2nc(CCCCCCCCc3nn(CNc4ccc5ccccc5c4O)c(=S)o3)oc2=S)ccc2ccccc12
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?