The CAS Registry Mumber 105307-23-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,3,0 and 7 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 105307-23: (8*1)+(7*0)+(6*5)+(5*3)+(4*0)+(3*7)+(2*2)+(1*3)=81 81 % 10 = 1 So 105307-23-1 is a valid CAS Registry Number.
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