3,4-二氯-1,2,3,4-四甲基环丁烯

3-chloro-1,2,3-trimethyl-4-methylidenecyclobutene

1,2,3,4-Tetrachlor-2,3,4-trimethyl-1-chlormethyl-cyclobutan

trans-3-Hydroxy-1,2,3,4-tetramethyl-cyclobuten-(1)