CCn1cc(C(=O)N[C@@H](CC(C)C)C(=O)NCCCn2ccnc2)c(=O)c2cc3c(cc21)OCO3
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?