The CAS Registry Mumber 157458-65-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,4,5 and 8 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 157458-65: (8*1)+(7*5)+(6*7)+(5*4)+(4*5)+(3*8)+(2*6)+(1*5)=166 166 % 10 = 6 So 157458-65-6 is a valid CAS Registry Number.
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