The CAS Registry Mumber 39288-70-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,2,8 and 8 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 39288-70: (7*3)+(6*9)+(5*2)+(4*8)+(3*8)+(2*7)+(1*0)=155 155 % 10 = 5 So 39288-70-5 is a valid CAS Registry Number.
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