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4-acetylaminonaphthalic-1,8-anhydride is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.

26558-91-8

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26558-91-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 26558-91-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,5,5 and 8 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 26558-91:
(7*2)+(6*6)+(5*5)+(4*5)+(3*8)+(2*9)+(1*1)=138
138 % 10 = 8
So 26558-91-8 is a valid CAS Registry Number.

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