The CAS Registry Mumber 134958-20-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,4,9,5 and 8 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 134958-20: (8*1)+(7*3)+(6*4)+(5*9)+(4*5)+(3*8)+(2*2)+(1*0)=146 146 % 10 = 6 So 134958-20-6 is a valid CAS Registry Number.
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