SEARCH Articles Figures Tables Benzoquinones via cyclobutenone ring opening Cyclobutenone Cyclobutenones Cyclobutenones electrocyclic ring opening Ketenes, vinyl12 + 2] cycloaddition via cyclobutenone ring opening Khellinone via cyclobutenone ring opening Mycophenolic acid via cyclobutenone ring opening Nanaomycin via cyclobutenone ring opening Ring opening of cyclobutenones Ring opening reactions cyclobutenones