The CAS Registry Mumber 27308-87-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,3,0 and 8 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 27308-87: (7*2)+(6*7)+(5*3)+(4*0)+(3*8)+(2*8)+(1*7)=118 118 % 10 = 8 So 27308-87-8 is a valid CAS Registry Number.
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