The CAS Registry Mumber 73385-54-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,3,8 and 5 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 73385-54: (7*7)+(6*3)+(5*3)+(4*8)+(3*5)+(2*5)+(1*4)=143 143 % 10 = 3 So 73385-54-3 is a valid CAS Registry Number.
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