The CAS Registry Mumber 196801-15-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,6,8,0 and 1 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 196801-15: (8*1)+(7*9)+(6*6)+(5*8)+(4*0)+(3*1)+(2*1)+(1*5)=157 157 % 10 = 7 So 196801-15-7 is a valid CAS Registry Number.
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