The CAS Registry Mumber 91377-18-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,3,7 and 7 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 91377-18: (7*9)+(6*1)+(5*3)+(4*7)+(3*7)+(2*1)+(1*8)=143 143 % 10 = 3 So 91377-18-3 is a valid CAS Registry Number.
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