The CAS Registry Mumber 1530-21-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,3 and 0 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1530-21: (6*1)+(5*5)+(4*3)+(3*0)+(2*2)+(1*1)=48 48 % 10 = 8 So 1530-21-8 is a valid CAS Registry Number.
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