The CAS Registry Mumber 145986-91-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,5,9,8 and 6 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 145986-91: (8*1)+(7*4)+(6*5)+(5*9)+(4*8)+(3*6)+(2*9)+(1*1)=180 180 % 10 = 0 So 145986-91-0 is a valid CAS Registry Number.
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