The CAS Registry Mumber 213408-76-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,3,4,0 and 8 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 213408-76: (8*2)+(7*1)+(6*3)+(5*4)+(4*0)+(3*8)+(2*7)+(1*6)=105 105 % 10 = 5 So 213408-76-5 is a valid CAS Registry Number.
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