The CAS Registry Mumber 90218-40-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,2,1 and 8 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 90218-40: (7*9)+(6*0)+(5*2)+(4*1)+(3*8)+(2*4)+(1*0)=109 109 % 10 = 9 So 90218-40-9 is a valid CAS Registry Number.
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Get Best Price for90218-40-9Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-nitro-, reaction products with 4-[(4-aminophenyl)azo]benzenesulfonic acid, reduced, oxidized, sodium salts