The CAS Registry Mumber 58277-20-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,2,7 and 7 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 58277-20: (7*5)+(6*8)+(5*2)+(4*7)+(3*7)+(2*2)+(1*0)=146 146 % 10 = 6 So 58277-20-6 is a valid CAS Registry Number.
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