The CAS Registry Mumber 204381-30-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,3,8 and 1 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 204381-30: (8*2)+(7*0)+(6*4)+(5*3)+(4*8)+(3*1)+(2*3)+(1*0)=96 96 % 10 = 6 So 204381-30-6 is a valid CAS Registry Number.
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