CC(C)(C)OC[C@H](NC(=O)OC(C)(C)C)c1nnc([C@H](CCC(=O)OC(C)(C)C)NC(=O)C2CCN(C(=O)OC(C)(C)C)CC2)o1
Drug-like molecules usually have no more than 5 Hydrogen bond donor. How many hydrogen bond donor does the molecule have?