The CAS Registry Mumber 68241-56-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,2,4 and 1 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 68241-56: (7*6)+(6*8)+(5*2)+(4*4)+(3*1)+(2*5)+(1*6)=135 135 % 10 = 5 So 68241-56-5 is a valid CAS Registry Number.
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