The Butanedioic acid, 2-hydroxy-2-methyl-, (2S)-, with the CAS registry number of 6236-09-5, is also known as (S)-(+)-Citramalic acid and L-(+)-2-Methylmalic acid. Its EINECS registry number is 228-350-1. This chemical's molecular formula is C₅H₈O₅ and molecular weight is 148.11. What's more, its IUPAC name is (2S)-2-Hydroxy-2-methylbutanedioic acid.

Physical properties about Butanedioic acid, 2-hydroxy-2-methyl-, (2S)- are: (1)ACD/LogP: -0.91; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -4.03; (4)ACD/LogD (pH 7.4): -5.65; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 5; (10)#H bond donors: 3; (11)#Freely Rotating Bonds: 4; (12)Polar Surface Area: 61.83 Å²; (13)Index of Refraction: 1.521; (14)Molar Refractivity: 29.84 cm³; (15)Molar Volume: 97.8 cm³; (16)Polarizability: 11.83×10^-24 cm³; (17)Surface Tension: 73.4 dyne/cm; (18)Density: 1.513 g/cm³; (19)Flash Point: 146.6 °C; (20)Enthalpy of Vaporization: 62.05 kJ/mol; (21)Boiling Point: 295.2 °C at 760 mmHg; (22)Vapour Pressure: 0.000161 mmHg at 25 °C; (23)Melting Point: 109-111 °C(lit. ).

When you are using this chemical, please be cautious about it as the following:
As a chemical, it is irritating to eyes, respiratory system and skin. In addition, this chemical may cause inflammation to the skin or other mucous membranes. During using it, wear suitable protective clothing. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1) SMILES: O=C(O)C(O)(C)CC(=O)O
(2) InChI: InChI=1/C5H8O5/c1-5(10,4(8)9)2-3(6)7/h10H,2H2,1H3,(H,6,7)(H,8,9)
(3) InChIKey: XFTRTWQBIOMVPK-UHFFFAOYAT