The CAS Registry Mumber 105437-18-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,4,3 and 7 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 105437-18: (8*1)+(7*0)+(6*5)+(5*4)+(4*3)+(3*7)+(2*1)+(1*8)=101 101 % 10 = 1 So 105437-18-1 is a valid CAS Registry Number.
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