This chemical is called 2,5-Dihydro-1-methyl-1H-phosphole 1-oxide, and its IUPAC name is 1-methyl-2,5-dihydro-1λ⁵-phosphole 1-oxide. With the CAS number of 930-38-1, its molecular formula is C₅H₉OP. Usually, the molecular weight of the 2,5-Dihydro-1-methyl-1H-phosphole 1-oxide is 116.10.

Other characteristics of the 2,5-Dihydro-1-methyl-1H-phosphole 1-oxide can be summarised as followings: (1)#H bond acceptors: 1; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 0; (4)Polar Surface Area: 26.88 Å²; (5)Index of Refraction: 1.446; (6)Molar Refractivity: 29.79 cm³; (7)Molar Volume: 111.6 cm³; (8)Polarizability: 11.81×10-²⁴cm³; (9)Surface Tension: 29.1 dyne/cm; (10)Density: 1.03 g/cm³; (11)Flash Point: 120 °C; (12)Enthalpy of Vaporization: 49.26 kJ/mol; (13)Boiling Point: 274.9 °C at 760 mmHg; (14)Vapour Pressure: 0.00884 mmHg at 25°C; (15)XLogP3-AA: -0.4; (16)H-Bond Acceptor: 1; (17)Exact Mass: 116.039101; (18)MonoIsotopic Mass: 116.039101; (19)Topological Polar Surface Area: 17.1; (20)Heavy Atom Count: 7; (21)Formal Charge: 0; (22)Complexity: 125; (23)Covalently-Bonded Unit Count: 1.

You can still convert the following datas into molecular structure: 
(1)SMILES: O=P1(C)C/C=C\C1
(2)InChI: InChI=1/C5H9OP/c1-7(6)4-2-3-5-7/h2-3H,4-5H2,1H3
(3)InChIKey: MQLQAXIVFGHSDE-UHFFFAOYAZ
(4)Std. InChI: InChI=1S/C5H9OP/c1-7(6)4-2-3-5-7/h2-3H,4-5H2,1H3
(5)Std. InChIKey: MQLQAXIVFGHSDE-UHFFFAOYSA-N