The CAS Registry Mumber 786681-44-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,8,6,6,8 and 1 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 786681-44: (8*7)+(7*8)+(6*6)+(5*6)+(4*8)+(3*1)+(2*4)+(1*4)=225 225 % 10 = 5 So 786681-44-5 is a valid CAS Registry Number.
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