IUPAC Name: 1-hydroxy-4-(4-methylanilino)anthracene-9,10-dione 
Empirical Formula: C₂₁H₁₅NO₃
Molecular Weight: 329.3487g/mol
EINECS: 201-353-5 
Structure of 1-Hydroxy-4-(p-toluidino)anthraquinone (CAS NO.81-48-1):

Index of Refraction: 1.72
Molar Refractivity: 94.74 cm³
Molar Volume: 239.8 cm³
Polarizability: 37.56×10^-24cm³
Surface Tension: 67.9 dyne/cm
Density: 1.373 g/cm³
Flash Point: 268.7 °C
Enthalpy of Vaporization: 82.37 kJ/mol
Boiling Point: 520.7 °C at 760 mmHg
Vapour Pressure: 1.84E-11 mmHg at 25°C 
Product Categories: Dyes and Pigments;Aminoanthraquinones;Anthraquinones;Hydroxyanthraquinones;Solvent Dyestuff 
Canonical SMILES: CC1=CC=C(C=C1)NC2=C3C(=C(C=C2)O)C(=O)C4=CC=CC=C4C3=O
InChI: InChI=1S/C21H15NO3/c1-12-6-8-13(9-7-12)22-16-10-11-17(23)19-18(16)20(24)14-4-2-3-5-15(14)21(19)25/h2-11,22-23H,1H3
InChIKey: LJFWQNJLLOFIJK-UHFFFAOYSA-N

 1-Hydroxy-4-(p-toluidino)anthraquinone (CAS NO.81-48-1) is used to dye hydrocarbon products like solvents and petrol, thermoplastics, synthetic resins, and synthetic fiber. It is also used in cosmetics, In pyrotechnics, it is used in some violet colored smoke compositions.

Reported in EPA TSCA Inventory.

A poison by intratracheal route. Mutation data reported. When heated to decomposition it emits toxic fumes of NO_x.
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36/37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
RTECS: CB7700000
Hazardous Substances Data: 81-48-1(Hazardous Substances Data)

 1-Hydroxy-4-(p-toluidino)anthraquinone , its cas register number is 81-48-1. It also can be called 10-Anthracenedione,1-hydroxy-4-(4-methylphenyl)amino-9 ; 11092violet;1-hydroxy-4-((4-methylphenyl)amino)-10-anthracenedione ; 1-hydroxy-4-(p-toluidino)-anthraquinon ; 1-Hydroxy-4-(p-toluido)anthraquinone ; 1-hydroxy-4-[(4-methylphenyl)amino]-10-anthracenedione ; 1-hydroxy-4-p-toluidino-anthraquinon ; 9,10-Anthracenedione,1-hydroxy-4-(4-methylphenyl)amino- .