The CAS Registry Mumber 885623-67-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,5,6,2 and 3 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 885623-67: (8*8)+(7*8)+(6*5)+(5*6)+(4*2)+(3*3)+(2*6)+(1*7)=216 216 % 10 = 6 So 885623-67-6 is a valid CAS Registry Number.
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