The CAS Registry Mumber 35781-16-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,7,8 and 1 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 35781-16: (7*3)+(6*5)+(5*7)+(4*8)+(3*1)+(2*1)+(1*6)=129 129 % 10 = 9 So 35781-16-9 is a valid CAS Registry Number.
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