The CAS Registry Mumber 873583-49-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,3,5,8 and 3 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 873583-49: (8*8)+(7*7)+(6*3)+(5*5)+(4*8)+(3*3)+(2*4)+(1*9)=214 214 % 10 = 4 So 873583-49-4 is a valid CAS Registry Number.
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