The CAS Registry Mumber 7230-18-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,2,3 and 0 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 7230-18: (6*7)+(5*2)+(4*3)+(3*0)+(2*1)+(1*8)=74 74 % 10 = 4 So 7230-18-4 is a valid CAS Registry Number.
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