CCCCS(=O)(=O)N1C2=NC(C(=O)OC)=C(C(=O)OC)[C@@H]3N(Cc4ccccc4)c4ccccc4[C@]23C[C@H]1C(=O)OC
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?