The CAS Registry Mumber 90901-34-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,9,0 and 1 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 90901-34: (7*9)+(6*0)+(5*9)+(4*0)+(3*1)+(2*3)+(1*4)=121 121 % 10 = 1 So 90901-34-1 is a valid CAS Registry Number.
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