The CAS Registry Mumber 163702-16-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,3,7,0 and 2 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 163702-16: (8*1)+(7*6)+(6*3)+(5*7)+(4*0)+(3*2)+(2*1)+(1*6)=117 117 % 10 = 7 So 163702-16-7 is a valid CAS Registry Number.
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