The CAS Registry Mumber 215929-07-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,5,9,2 and 9 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 215929-07: (8*2)+(7*1)+(6*5)+(5*9)+(4*2)+(3*9)+(2*0)+(1*7)=140 140 % 10 = 0 So 215929-07-0 is a valid CAS Registry Number.
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