The CAS Registry Mumber 58857-49-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,8,5 and 7 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 58857-49: (7*5)+(6*8)+(5*8)+(4*5)+(3*7)+(2*4)+(1*9)=181 181 % 10 = 1 So 58857-49-1 is a valid CAS Registry Number.
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