The CAS Registry Mumber 37158-54-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,1,5 and 8 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 37158-54: (7*3)+(6*7)+(5*1)+(4*5)+(3*8)+(2*5)+(1*4)=126 126 % 10 = 6 So 37158-54-6 is a valid CAS Registry Number.
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