The CAS Registry Mumber 637345-58-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,7,3,4 and 5 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 637345-58: (8*6)+(7*3)+(6*7)+(5*3)+(4*4)+(3*5)+(2*5)+(1*8)=175 175 % 10 = 5 So 637345-58-5 is a valid CAS Registry Number.
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