The CAS Registry Mumber 160691-52-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,0,6,9 and 1 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 160691-52: (8*1)+(7*6)+(6*0)+(5*6)+(4*9)+(3*1)+(2*5)+(1*2)=131 131 % 10 = 1 So 160691-52-1 is a valid CAS Registry Number.
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