The CAS Registry Mumber 203866-87-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,8,6 and 6 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 203866-87: (8*2)+(7*0)+(6*3)+(5*8)+(4*6)+(3*6)+(2*8)+(1*7)=139 139 % 10 = 9 So 203866-87-9 is a valid CAS Registry Number.
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