D&C Red 33
D&C Red 33
IUPAC name
Disodium 5-amino-4-hydroxy-3-(phenylazo)-naphthalene-2,7-disulphonate
Other names
D&C Red 33, Acid Red 33,
Identifiers
CAS number
3567-66-6
Properties
Molecular formula
C16H11N3Na2O7S2
Molar mass
467.38 g mol−1
Appearance
Dark reddish brown powder
Melting point
decomposes below the melting point
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox references
D&C Red 33 also known as Acid Red 33 or simply Red 33 is a red azo dye [...]