The CAS Registry Mumber 62653-47-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,6,5 and 3 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 62653-47: (7*6)+(6*2)+(5*6)+(4*5)+(3*3)+(2*4)+(1*7)=128 128 % 10 = 8 So 62653-47-8 is a valid CAS Registry Number.
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