1,4-二甲基萘

1r.3t-bis-(2.2-dicarboxy-vinyl)-2c.4t-diphenyl-cyclobutane

2,2'-dicyano-3,3'-(2,4-diphenyl-cyclobutane-1,3-diyl)-di-acrylic acid dimethyl ester

丁炔二酸

2-(2-carboxymethoxy-4-methoxy-benzoyl)-4,5-dimethoxy-benzoic acid