The CAS Registry Mumber 63981-47-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,9,8 and 1 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 63981-47: (7*6)+(6*3)+(5*9)+(4*8)+(3*1)+(2*4)+(1*7)=155 155 % 10 = 5 So 63981-47-5 is a valid CAS Registry Number.
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