The CAS Registry Mumber 1189-80-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,1,8 and 9 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1189-80: (6*1)+(5*1)+(4*8)+(3*9)+(2*8)+(1*0)=86 86 % 10 = 6 So 1189-80-6 is a valid CAS Registry Number.
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