The CAS Registry Mumber 637320-81-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,7,3,2 and 0 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 637320-81: (8*6)+(7*3)+(6*7)+(5*3)+(4*2)+(3*0)+(2*8)+(1*1)=151 151 % 10 = 1 So 637320-81-1 is a valid CAS Registry Number.
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