The CAS Registry Mumber 54388-16-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,3,8 and 8 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 54388-16: (7*5)+(6*4)+(5*3)+(4*8)+(3*8)+(2*1)+(1*6)=138 138 % 10 = 8 So 54388-16-8 is a valid CAS Registry Number.
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