The CAS Registry Mumber 646507-14-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,6,5,0 and 7 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 646507-14: (8*6)+(7*4)+(6*6)+(5*5)+(4*0)+(3*7)+(2*1)+(1*4)=164 164 % 10 = 4 So 646507-14-4 is a valid CAS Registry Number.
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