The CAS Registry Mumber 138569-43-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,5,6 and 9 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 138569-43: (8*1)+(7*3)+(6*8)+(5*5)+(4*6)+(3*9)+(2*4)+(1*3)=164 164 % 10 = 4 So 138569-43-4 is a valid CAS Registry Number.
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monosodium salt