The CAS Registry Mumber 104211-58-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,4,2,1 and 1 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 104211-58: (8*1)+(7*0)+(6*4)+(5*2)+(4*1)+(3*1)+(2*5)+(1*8)=67 67 % 10 = 7 So 104211-58-7 is a valid CAS Registry Number.
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