The CAS Registry Mumber 172602-90-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,6,0 and 2 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 172602-90: (8*1)+(7*7)+(6*2)+(5*6)+(4*0)+(3*2)+(2*9)+(1*0)=123 123 % 10 = 3 So 172602-90-3 is a valid CAS Registry Number.
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