fragments: ['CC(C)(C)O', 'CCOCC(C)NC(=O)CCCNC=O', 'CCOCC(C)N', 'CC(C)(C)OC(=O)NCCCC=O', 'CC(C)(C)OC=O', 'CCOCC(C)NC(=O)CCCN', 'CC', 'CC(CO)NC(=O)CCCNC(=O)OC(C)(C)C', 'CCO', 'CC(C)NC(=O)CCCNC(=O)OC(C)(C)C', 'CC(C)C', 'CCOCC(C)NC(=O)CCCNC(=O)O', 'CCCOCC', 'CC(C)(C)OC(=O)NCCCC(N)=O', 'CC(C)(C)OC(N)=O', 'CCCC(=O)NC(C)COCC']