The CAS Registry Mumber 53155-39-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,1,5 and 5 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 53155-39: (7*5)+(6*3)+(5*1)+(4*5)+(3*5)+(2*3)+(1*9)=108 108 % 10 = 8 So 53155-39-8 is a valid CAS Registry Number.
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