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Check Digit Verification of cas no

The CAS Registry Mumber 268736-91-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,8,7,3 and 6 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 268736-91:
190 % 10 = 0
So 268736-91-0 is a valid CAS Registry Number.
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