The CAS Registry Mumber 666207-93-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,6,2,0 and 7 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 666207-93: (8*6)+(7*6)+(6*6)+(5*2)+(4*0)+(3*7)+(2*9)+(1*3)=178 178 % 10 = 8 So 666207-93-8 is a valid CAS Registry Number.
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