The CAS Registry Mumber 189386-90-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,3,8 and 6 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 189386-90: (8*1)+(7*8)+(6*9)+(5*3)+(4*8)+(3*6)+(2*9)+(1*0)=201 201 % 10 = 1 So 189386-90-1 is a valid CAS Registry Number.
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