The CAS Registry Mumber 652-01-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,5 and 2 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 652-01: (5*6)+(4*5)+(3*2)+(2*0)+(1*1)=57 57 % 10 = 7 So 652-01-7 is a valid CAS Registry Number.
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