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4-Hydroxy-α-[3-hydroxy-4-(4-hydroxyphenyl)-5-oxofuran-2(5H)-ylidene]benzeneacetic acid, also known as alizarin yellow R, is a complex organic compound with the chemical formula C20H12O8. It is a yellow crystalline solid that is soluble in water and ethanol. 4-Hydroxy-α-[3-hydroxy-4-(4-hydroxyphenyl)-5-oxofuran-2(5H)-ylidene]benzeneacetic acid is a derivative of alizarin, a natural dye found in the madder plant, and is used as a pH indicator, colorant, and analytical reagent. It is also employed in the textile, paper, and leather industries for dyeing purposes. Alizarin yellow R exhibits a color change from yellow to red in acidic solutions and from red to yellow in basic solutions, making it a useful tool for determining the pH of a solution.

521-56-2

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521-56-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 521-56-2 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,2 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 521-56:
(5*5)+(4*2)+(3*1)+(2*5)+(1*6)=52
52 % 10 = 2
So 521-56-2 is a valid CAS Registry Number.

521-56-2SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017

1.Identification

1.1 GHS Product identifier

Product name Atromentic acid

1.2 Other means of identification

Product number -
Other names [3-hydroxy-4-(4-hydroxy-phenyl)-5-oxo-5H-furan-2-ylidene]-(4-hydroxy-phenyl)-acetic acid

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:521-56-2 SDS

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