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Check Digit Verification of cas no

The CAS Registry Mumber 307541-04-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,7,5,4 and 1 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 307541-04:
114 % 10 = 4
So 307541-04-4 is a valid CAS Registry Number.
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