The delta-Nonalactone, with the CAS registry number 3301-94-8, is also known as 5-Hydroxynonanoic acid lactone. Its EINECS number is 221-974-5. This chemical's molecular formula is C₉H₁₆O₂ and molecular weight is 156.22. What's more, its systematic name is 6-Butyltetrahydro-2H-pyran-2-one. It is stable at common pressure and temperature, and it should be sealed and stored in a ventilated and dry place. Moreover, it should be protected from light. It is flammable, so you should keep it away from sources of ignition - No smoking. 

Physical properties of delta-Nonalactone are: (1)ACD/LogP: 1.959; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 1.96; (4)ACD/LogD (pH 7.4): 1.96; (5)ACD/BCF (pH 5.5): 18.16; (6)ACD/BCF (pH 7.4): 18.16; (7)ACD/KOC (pH 5.5): 277.29; (8)ACD/KOC (pH 7.4): 277.29; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 3; (12)Polar Surface Area: 26.3 Å²; (13)Index of Refraction: 1.44; (14)Molar Refractivity: 43.387 cm³; (15)Molar Volume: 164.58 cm³; (16)Polarizability: 17.2×10^-24cm³; (17)Surface Tension: 29.75 dyne/cm; (18)Density: 0.949 g/cm³; (19)Flash Point: 99.09 °C; (20)Enthalpy of Vaporization: 49.071 kJ/mol; (21)Boiling Point: 253.326 °C at 760 mmHg; (22)Vapour Pressure: 0.018 mmHg at 25°C.

Preparation of delta-Nonalactone: this chemical can be prepared by 2-butyl-cyclopentanone at the temperature of 50 - 70 °C. This reaction will need reagents MoOBr₃, H₂O₂, AcOH, Ac₂O with the reaction time of 6 hours. The yield is about 78%.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C1OC(CCCC)CCC1
(2)Std. InChI: InChI=1S/C9H16O2/c1-2-3-5-8-6-4-7-9(10)11-8/h8H,2-7H2,1H3
(3)Std. InChIKey: PXRBWNLUQYZAAX-UHFFFAOYSA-N