The CAS Registry Mumber 54604-91-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,6,0 and 4 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 54604-91: (7*5)+(6*4)+(5*6)+(4*0)+(3*4)+(2*9)+(1*1)=120 120 % 10 = 0 So 54604-91-0 is a valid CAS Registry Number.
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