The CAS Registry Mumber 63631-46-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,6,3 and 1 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 63631-46: (7*6)+(6*3)+(5*6)+(4*3)+(3*1)+(2*4)+(1*6)=119 119 % 10 = 9 So 63631-46-9 is a valid CAS Registry Number.
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