640725-40-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 640725-40-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,0,7,2 and 5 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 640725-40:
(8*6)+(7*4)+(6*0)+(5*7)+(4*2)+(3*5)+(2*4)+(1*0)=142
142 % 10 = 2
So 640725-40-2 is a valid CAS Registry Number.
640725-40-2Relevant academic research and scientific papers
Para-phenylenediamine derivatives containing a pyrrolidyl group, and use of these derivatives for coloring keratin fibers
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Page 10, (2008/06/13)
The invention relates to novel pyrrolidyl-substituted para-phenylenediamine derivatives, to dye compositions containing them and to the process for dyeing keratin fibers using these compositions. The present invention makes it possible in particular to ob
