δ-Valerolactone
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δ-Valerolactone is a lactone used as a chemical intermediate in processes such as the production of polyesters. Wikipedia
Boiling point: 426.2°F (219°C)
Molar mass: 100.116 g/mol
Density: 1.08 g/cm³
Formula: C5H8O2
Melting point: −13 °C (9 °F; 260 K)