The CAS Registry Mumber 347406-21-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,7,4,0 and 6 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 347406-21: (8*3)+(7*4)+(6*7)+(5*4)+(4*0)+(3*6)+(2*2)+(1*1)=137 137 % 10 = 7 So 347406-21-7 is a valid CAS Registry Number.
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