The CAS Registry Mumber 388563-81-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,8,8,5,6 and 3 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 388563-81: (8*3)+(7*8)+(6*8)+(5*5)+(4*6)+(3*3)+(2*8)+(1*1)=203 203 % 10 = 3 So 388563-81-3 is a valid CAS Registry Number.
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