The CAS Registry Mumber 38128-76-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,1,2 and 8 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 38128-76: (7*3)+(6*8)+(5*1)+(4*2)+(3*8)+(2*7)+(1*6)=126 126 % 10 = 6 So 38128-76-6 is a valid CAS Registry Number.
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