The CAS Registry Mumber 38553-32-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,5,5 and 3 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 38553-32: (7*3)+(6*8)+(5*5)+(4*5)+(3*3)+(2*3)+(1*2)=131 131 % 10 = 1 So 38553-32-1 is a valid CAS Registry Number.
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