The CAS Registry Mumber 158300-47-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,3,0 and 0 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 158300-47: (8*1)+(7*5)+(6*8)+(5*3)+(4*0)+(3*0)+(2*4)+(1*7)=121 121 % 10 = 1 So 158300-47-1 is a valid CAS Registry Number.
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