The CAS Registry Mumber 6545-58-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,5,4 and 5 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 6545-58: (6*6)+(5*5)+(4*4)+(3*5)+(2*5)+(1*8)=110 110 % 10 = 0 So 6545-58-0 is a valid CAS Registry Number.
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