The CAS Registry Mumber 185436-89-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,4,3 and 6 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 185436-89: (8*1)+(7*8)+(6*5)+(5*4)+(4*3)+(3*6)+(2*8)+(1*9)=169 169 % 10 = 9 So 185436-89-9 is a valid CAS Registry Number.
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