The CAS Registry Mumber 54921-80-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,9,2 and 1 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 54921-80: (7*5)+(6*4)+(5*9)+(4*2)+(3*1)+(2*8)+(1*0)=131 131 % 10 = 1 So 54921-80-1 is a valid CAS Registry Number.
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