The CAS Registry Mumber 143693-54-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,6,9 and 3 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 143693-54: (8*1)+(7*4)+(6*3)+(5*6)+(4*9)+(3*3)+(2*5)+(1*4)=143 143 % 10 = 3 So 143693-54-3 is a valid CAS Registry Number.
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