Reported in EPA TSCA Inventory.

The Mercaptosuccinic acid, with the CAS registry number 70-49-5, is also known as Monomercaptosuccinic acid. Its EINECS registry number is 200-736-4. This chemical's molecular formula is C₄H₆O₄S and molecular weight is 150.15. Its IUPAC name is called 2-sulfanylbutanedioic acid. The product is the main component of cold wave pharmaceutical. Mercaptosuccinic acid is also used in complexation concealment, biochemical research, heavy metal antidotes and rubber industries.

Physical properties of Mercaptosuccinic acid: (1)ACD/BCF (pH 5.5): 1; (2)ACD/BCF (pH 7.4): 1; (3)ACD/KOC (pH 5.5): 1; (4)ACD/KOC (pH 7.4): 1; (5)#H bond acceptors: 4; (6)#H bond donors: 2; (7)#Freely Rotating Bonds: 4; (8)Index of Refraction: 1.556; (9)Molar Refractivity: 31.565 cm³; (10)Molar Volume: 98.238 cm³; (11)Surface Tension: 69.969 dyne/cm; (12)Density: 1.528 g/cm³; (13)Flash Point: 108.807 °C; (14)Enthalpy of Vaporization: 54.368 kJ/mol; (15)Boiling Point: 256.3 °C at 760 mmHg; (16)Vapour Pressure: 0.005 mmHg at 25°C.

Uses of Mercaptosuccinic acid: It forms the backbone of the pesticide malathion. it can be used to produce mercaptosuccinic acid diethyl ester with ethanol. This reaction will need reagent hydrogen chloride.

When you are using this chemical, please be cautious about it as the following:
This chemical may destroy living tissue on contact and may cause burns. It is harmful by inhalation, in contact with skin and if swallowed. In addition, it is irritating to eyes, respiratory system and skin. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. Whenever you will contact it, please wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell seek medical advice immediately (show the label where possible).

You can still convert the following datas into molecular structure:
(1)Canonical SMILES: C(C(C(=O)O)S)C(=O)O
(2)InChI: InChI=1S/C4H6O4S/c5-3(6)1-2(9)4(7)8/h2,9H,1H2,(H,5,6)(H,7,8)
(3)InChIKey: NJRXVEJTAYWCQJ-UHFFFAOYSA-N

The toxicity data is as follows: