The CAS Registry Mumber 68638-34-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,6,3 and 8 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 68638-34: (7*6)+(6*8)+(5*6)+(4*3)+(3*8)+(2*3)+(1*4)=166 166 % 10 = 6 So 68638-34-6 is a valid CAS Registry Number.
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