fragments: ['CC(C)(C)NCC=O', 'NCC(=O)NC1CC1', 'NC1CC1', 'CC(C)(C)NCC(=O)NCC=O', 'CC(C)C', 'NCC(=O)NCC(=O)NC1CC1', 'CC(C)(C)N', 'CC(=O)NCC(=O)NC1CC1', 'CC(=O)NC1CC1', 'CC(C)(C)NCC(N)=O', 'C1CC1', 'CC(C)(C)NCC(=O)NCC(N)=O']