The CAS Registry Mumber 23545-70-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,5,4 and 5 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 23545-70: (7*2)+(6*3)+(5*5)+(4*4)+(3*5)+(2*7)+(1*0)=102 102 % 10 = 2 So 23545-70-2 is a valid CAS Registry Number.
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