The CAS Registry Mumber 102561-54-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,5,6 and 1 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 102561-54: (8*1)+(7*0)+(6*2)+(5*5)+(4*6)+(3*1)+(2*5)+(1*4)=86 86 % 10 = 6 So 102561-54-6 is a valid CAS Registry Number.
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