1-phenyl-3,3,4-trifluoro-4-chloro-1-cyclobutene

(3,3,4,4-四氟-1-环丁烯)-苯

3-phenyl-3,6-dihydro-pyridazine-1,2-dicarboxylic acid diethyl ester

2,4-dichloro-3-phenylcyclobut-2-en-1-one

2-hydroxy-3-phenyl-cyclobutenone