The CAS Registry Mumber 4643-88-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,6,4 and 3 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 4643-88: (6*4)+(5*6)+(4*4)+(3*3)+(2*8)+(1*8)=103 103 % 10 = 3 So 4643-88-3 is a valid CAS Registry Number.
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