S=c1nc(Nc2ccc(Br)cc2)c2c3c(sc2[nH]1)CN(N1CCc2c(sc4[nH]c(=S)nc(Nc5ccc(Br)cc5)c24)C1)CC3
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?