The CAS Registry Mumber 83372-55-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,3,7 and 2 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 83372-55: (7*8)+(6*3)+(5*3)+(4*7)+(3*2)+(2*5)+(1*5)=138 138 % 10 = 8 So 83372-55-8 is a valid CAS Registry Number.
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