The CAS Registry Mumber 346621-41-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,6,6,2 and 1 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 346621-41: (8*3)+(7*4)+(6*6)+(5*6)+(4*2)+(3*1)+(2*4)+(1*1)=138 138 % 10 = 8 So 346621-41-8 is a valid CAS Registry Number.
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