['N#CCCN', 'COCCN(CC=O)Cc1ccco1', 'CO', 'CCN(CC(=O)NCCC#N)Cc1ccco1', 'CCOC', 'N#CCCNC(=O)CNCc1ccco1', 'CC(=O)NCCC#N', 'COCCNCc1ccco1', 'CCC#N', 'COCCN(CC(N)=O)Cc1ccco1', 'Cc1ccco1', 'COCCNCC(=O)NCCC#N', 'c1ccoc1', 'COCCN(C)CC(=O)NCCC#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccoc1.