Ключевые слова: atom, atomic, c4h8o, carbon, chemical, chemical formula, chemistry, cyclic ether, design, drawing, education, educational, flat, formula, heterocyclic, hydrogen, icon, illustration, molecular, molecular structure, molecule, organic, organic compound, organic solvent, oxolane, oxygen, polar, polar solvent, science, scientific, solvent, structural formula, study, tetrahydrofuran, thf,