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Check Digit Verification of cas no

The CAS Registry Mumber 23711-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,7,1 and 1 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 23711-18:
84 % 10 = 4
So 23711-18-4 is a valid CAS Registry Number.
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