The CAS Registry Mumber 2072-42-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,7 and 2 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 2072-42: (6*2)+(5*0)+(4*7)+(3*2)+(2*4)+(1*2)=56 56 % 10 = 6 So 2072-42-6 is a valid CAS Registry Number.
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