The CAS Registry Mumber 63815-54-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,8,1 and 5 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 63815-54: (7*6)+(6*3)+(5*8)+(4*1)+(3*5)+(2*5)+(1*4)=133 133 % 10 = 3 So 63815-54-3 is a valid CAS Registry Number.
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