The CAS Registry Mumber 227091-47-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,7,0,9 and 1 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 227091-47: (8*2)+(7*2)+(6*7)+(5*0)+(4*9)+(3*1)+(2*4)+(1*7)=126 126 % 10 = 6 So 227091-47-6 is a valid CAS Registry Number.
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