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Check Digit Verification of cas no

The CAS Registry Mumber 443991-48-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,3,9,9 and 1 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 443991-48:
178 % 10 = 8
So 443991-48-8 is a valid CAS Registry Number.
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