Texas The molecular formula C4H6 (molar mass: 54.09 g/mol) may refer to: 1,3-Butadiene 1,2-Butadiene Bicyclobutane Cyclobutene Dimethylacetylene (2-butyne) 1-Methylcyclopropene 3-Methylcyclopropene Methylenecyclopropane Trimethylenemethane 1-butyne