The CAS Registry Mumber 68512-34-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,5,1 and 2 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 68512-34: (7*6)+(6*8)+(5*5)+(4*1)+(3*2)+(2*3)+(1*4)=135 135 % 10 = 5 So 68512-34-5 is a valid CAS Registry Number.
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