The CAS Registry Mumber 157374-45-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,3,7 and 4 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 157374-45: (8*1)+(7*5)+(6*7)+(5*3)+(4*7)+(3*4)+(2*4)+(1*5)=153 153 % 10 = 3 So 157374-45-3 is a valid CAS Registry Number.
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