The CAS Registry Mumber 214334-16-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,4,3,3 and 4 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 214334-16: (8*2)+(7*1)+(6*4)+(5*3)+(4*3)+(3*4)+(2*1)+(1*6)=94 94 % 10 = 4 So 214334-16-4 is a valid CAS Registry Number.
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