The CAS Registry Mumber 163547-04-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,3,5,4 and 7 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 163547-04: (8*1)+(7*6)+(6*3)+(5*5)+(4*4)+(3*7)+(2*0)+(1*4)=134 134 % 10 = 4 So 163547-04-4 is a valid CAS Registry Number.
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