Title: Thiomalic Acid

CAS Registry Number: 70-49-5

CAS Name: Mercaptobutanedioic acid

Additional Names: mercaptosuccinic acid

Molecular Formula: C4H6O4S

Molecular Weight: 150.15

Percent Composition: C 32.00%, H 4.03%, O 42.62%, S 21.36%

Properties: White crystals; sulfidic odor. mp 149-150°. Soly in water at 40° about 50 g/100 ml; in ethanol at 25° about 50 g/100 ml. Also sol in acetone. Moderately sol in ether. Practically insol in benzene. The aq soln gives a transitory blue color with ferric chloride.

Melting point: mp 149-150°