The CAS Registry Mumber 156715-43-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,7,1 and 5 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 156715-43: (8*1)+(7*5)+(6*6)+(5*7)+(4*1)+(3*5)+(2*4)+(1*3)=144 144 % 10 = 4 So 156715-43-4 is a valid CAS Registry Number.
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