The CAS Registry Mumber 171542-56-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,1,5,4 and 2 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 171542-56: (8*1)+(7*7)+(6*1)+(5*5)+(4*4)+(3*2)+(2*5)+(1*6)=126 126 % 10 = 6 So 171542-56-6 is a valid CAS Registry Number.
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