The CAS Registry Mumber 68424-21-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,4,2 and 4 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 68424-21: (7*6)+(6*8)+(5*4)+(4*2)+(3*4)+(2*2)+(1*1)=135 135 % 10 = 5 So 68424-21-5 is a valid CAS Registry Number.
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