The CAS Registry Mumber 338978-23-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,3,8,9,7 and 8 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 338978-23: (8*3)+(7*3)+(6*8)+(5*9)+(4*7)+(3*8)+(2*2)+(1*3)=197 197 % 10 = 7 So 338978-23-7 is a valid CAS Registry Number.
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