The CAS Registry Mumber 59995-91-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,9,9,9 and 5 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 59995-91: (7*5)+(6*9)+(5*9)+(4*9)+(3*5)+(2*9)+(1*1)=204 204 % 10 = 4 So 59995-91-4 is a valid CAS Registry Number.
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