9-chloro-5-methoxy-6H-benzo[3,4]cyclobuta[1,2]cyclohepten-6-one

3,4-dimethoxyfluoren-9-one

5-chloro-7-methoxy-6H-benzo[3,4]cyclobuta[1,2][7]annulen-6-one

2-chloro-1-methoxy-9H-fluoren-9-one

2-chloro-1-methoxyfluorenone