The CAS Registry Mumber 660852-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,0,8,5 and 2 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 660852-40: (8*6)+(7*6)+(6*0)+(5*8)+(4*5)+(3*2)+(2*4)+(1*0)=164 164 % 10 = 4 So 660852-40-4 is a valid CAS Registry Number.
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