The CAS Registry Mumber 153753-45-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,3,7,5 and 3 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 153753-45: (8*1)+(7*5)+(6*3)+(5*7)+(4*5)+(3*3)+(2*4)+(1*5)=138 138 % 10 = 8 So 153753-45-8 is a valid CAS Registry Number.
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