The CAS Registry Mumber 137436-12-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,4,3 and 6 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 137436-12: (8*1)+(7*3)+(6*7)+(5*4)+(4*3)+(3*6)+(2*1)+(1*2)=125 125 % 10 = 5 So 137436-12-5 is a valid CAS Registry Number.
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