The CAS Registry Mumber 607406-42-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,0,7,4,0 and 6 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 607406-42: (8*6)+(7*0)+(6*7)+(5*4)+(4*0)+(3*6)+(2*4)+(1*2)=138 138 % 10 = 8 So 607406-42-8 is a valid CAS Registry Number.
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