The CAS Registry Mumber 95421-26-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,4,2 and 1 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 95421-26: (7*9)+(6*5)+(5*4)+(4*2)+(3*1)+(2*2)+(1*6)=134 134 % 10 = 4 So 95421-26-4 is a valid CAS Registry Number.
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