The CAS Registry Mumber 12645-49-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,6,4 and 5 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 12645-49: (7*1)+(6*2)+(5*6)+(4*4)+(3*5)+(2*4)+(1*9)=97 97 % 10 = 7 So 12645-49-7 is a valid CAS Registry Number.
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