The CAS Registry Mumber 58699-16-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,6,9 and 9 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 58699-16: (7*5)+(6*8)+(5*6)+(4*9)+(3*9)+(2*1)+(1*6)=184 184 % 10 = 4 So 58699-16-4 is a valid CAS Registry Number.
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