The CAS Registry Mumber 70723-03-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,7,2 and 3 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 70723-03: (7*7)+(6*0)+(5*7)+(4*2)+(3*3)+(2*0)+(1*3)=104 104 % 10 = 4 So 70723-03-4 is a valid CAS Registry Number.
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