The CAS Registry Mumber 62977-64-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,2,9,7 and 7 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 62977-64: (7*6)+(6*2)+(5*9)+(4*7)+(3*7)+(2*6)+(1*4)=164 164 % 10 = 4 So 62977-64-4 is a valid CAS Registry Number.
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