The CAS Registry Mumber 204519-32-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,5,1 and 9 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 204519-32: (8*2)+(7*0)+(6*4)+(5*5)+(4*1)+(3*9)+(2*3)+(1*2)=104 104 % 10 = 4 So 204519-32-4 is a valid CAS Registry Number.
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