The CAS Registry Mumber 173521-40-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,5,2 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 173521-40: (8*1)+(7*7)+(6*3)+(5*5)+(4*2)+(3*1)+(2*4)+(1*0)=119 119 % 10 = 9 So 173521-40-9 is a valid CAS Registry Number.
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