NCCC(=O)N[C@H](Cc1cc(O)c(O)c(SCC(NC(=O)CC[C@H](N)C(=O)O)C(=O)NCC(=O)O)c1)C(=O)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?