The CAS Registry Mumber 74691-24-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,6,9 and 1 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 74691-24: (7*7)+(6*4)+(5*6)+(4*9)+(3*1)+(2*2)+(1*4)=150 150 % 10 = 0 So 74691-24-0 is a valid CAS Registry Number.
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