The CAS Registry Mumber 1197238-80-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,9,7,2,3 and 8 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1197238-80: (9*1)+(8*1)+(7*9)+(6*7)+(5*2)+(4*3)+(3*8)+(2*8)+(1*0)=184 184 % 10 = 4 So 1197238-80-4 is a valid CAS Registry Number.
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