The CAS Registry Mumber 37685-40-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,6,8 and 5 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 37685-40: (7*3)+(6*7)+(5*6)+(4*8)+(3*5)+(2*4)+(1*0)=148 148 % 10 = 8 So 37685-40-8 is a valid CAS Registry Number.
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