The CAS Registry Mumber 121072-35-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,0,7 and 2 respectively; the second part has 2 digits, 3 and 5 respectively. Calculate Digit Verification of CAS Registry Number 121072-35: (8*1)+(7*2)+(6*1)+(5*0)+(4*7)+(3*2)+(2*3)+(1*5)=73 73 % 10 = 3 So 121072-35-3 is a valid CAS Registry Number.
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