Maleic Acid
Appearance: white crystal
CAS NO.: 110-16-7 ...
Fumaric Acid
Appearance: white powder or crystal
CAS NO.: 110-17-8...
Glyoxal
Appearance: Colorless liquid
CAS NO.: 107-22-2...
Glyoxylic Acid
Appearance: Colorless or yellowish liquid
CAS NO.: 298-12-4...
Succinic Acid
Appearance: Colorless or white crystal
CAS NO.: 110-15-6..