The CAS Registry Mumber 1335-63-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,3,3 and 5 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1335-63: (6*1)+(5*3)+(4*3)+(3*5)+(2*6)+(1*3)=63 63 % 10 = 3 So 1335-63-3 is a valid CAS Registry Number.
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