The CAS Registry Mumber 109358-28-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,3,5 and 8 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 109358-28: (8*1)+(7*0)+(6*9)+(5*3)+(4*5)+(3*8)+(2*2)+(1*8)=133 133 % 10 = 3 So 109358-28-3 is a valid CAS Registry Number.
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