The CAS Registry Mumber 106687-25-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,6,6,8 and 7 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 106687-25: (8*1)+(7*0)+(6*6)+(5*6)+(4*8)+(3*7)+(2*2)+(1*5)=136 136 % 10 = 6 So 106687-25-6 is a valid CAS Registry Number.
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