The CAS Registry Mumber 1254-30-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,5 and 4 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1254-30: (6*1)+(5*2)+(4*5)+(3*4)+(2*3)+(1*0)=54 54 % 10 = 4 So 1254-30-4 is a valid CAS Registry Number.
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