The CAS Registry Mumber 1207166-37-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,0,7,1,6 and 6 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1207166-37: (9*1)+(8*2)+(7*0)+(6*7)+(5*1)+(4*6)+(3*6)+(2*3)+(1*7)=127 127 % 10 = 7 So 1207166-37-7 is a valid CAS Registry Number.
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