The molecular formula C11H16O4 (molar mass: 212.24 g/mol) may refer to: 3,9-Diethylidene-2,4,8,10-tetraoxaspiro(5.5)undecane 3,9-Divinyl-2,4,8,10-tetraoxaspiro(5.5)undecane Methylenolactocin