The CAS Registry Mumber 226988-04-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,6,9,8 and 8 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 226988-04: (8*2)+(7*2)+(6*6)+(5*9)+(4*8)+(3*8)+(2*0)+(1*4)=171 171 % 10 = 1 So 226988-04-1 is a valid CAS Registry Number.
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