The CAS Registry Mumber 90131-55-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,1,3 and 1 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 90131-55: (7*9)+(6*0)+(5*1)+(4*3)+(3*1)+(2*5)+(1*5)=98 98 % 10 = 8 So 90131-55-8 is a valid CAS Registry Number.
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