The CAS Registry Mumber 1057726-57-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,5,7,7,2 and 6 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1057726-57: (9*1)+(8*0)+(7*5)+(6*7)+(5*7)+(4*2)+(3*6)+(2*5)+(1*7)=164 164 % 10 = 4 So 1057726-57-4 is a valid CAS Registry Number.
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